diff --git a/app/js/shipyard/factory-component-set.js b/app/js/shipyard/factory-component-set.js
index 59009639..26fdd3df 100755
--- a/app/js/shipyard/factory-component-set.js
+++ b/app/js/shipyard/factory-component-set.js
@@ -6,6 +6,13 @@ angular.module('shipyard').factory('ComponentSet', ['lodash', function(_) {
     });
   }
 
+  function getKey(maxClass, eligible) {
+    if (eligible) {
+      return maxClass + Object.keys(eligible).join('-');
+    }
+    return maxClass;
+  }
+
   function ComponentSet(components, mass, maxCommonArr, maxInternal, maxHardPoint) {
     this.mass = mass;
     this.common = {};
@@ -36,34 +43,57 @@ angular.module('shipyard').factory('ComponentSet', ['lodash', function(_) {
     for (var g in components.internal) {
       this.internal[g] = filter(components.internal[g], maxInternal, 0, mass);
     }
+
+    /**
+     * Create a memoized function for determining the components that are
+     * eligible for an internal slot
+     * @param  {integer} c        The max class component that can be mounted in the slot
+     * @param  {Object} eligible) The map of eligible internal groups
+     * @return {object}           A map of all eligible components by group
+     */
+    this.getInts = _.memoize(
+      function(c, eligible) {
+        var o = {};
+        for (var key in this.internal) {
+          if (eligible && !eligible[key]) {
+            continue;
+          }
+          var data = filter(this.internal[key], c, 0, this.mass);
+          if (data.length) {  // If group is not empty
+            o[key] = data;
+          }
+        }
+        return o;
+      },
+      getKey
+    );
+
+    /**
+     * Create a memoized function for determining the components that are
+     * eligible for an hardpoint slot
+     * @param  {integer} c        The max class component that can be mounted in the slot
+     * @param  {Object} eligible) The map of eligible hardpoint groups
+     * @return {object}           A map of all eligible components by group
+     */
+    this.getHps = _.memoize(
+      function(c, eligible) {
+        var o = {};
+        for (var key in this.hardpoints) {
+          if (eligible && !eligible[key]) {
+            continue;
+          }
+          var data = filter(this.hardpoints[key], c, c ? 1 : 0, this.mass);
+          if (data.length) {  // If group is not empty
+            o[key] = data;
+          }
+        }
+        return o;
+      },
+      getKey
+    );
+
   }
 
-  ComponentSet.prototype.getHps = function(c) {
-    if (!this.hpClass[c]) {
-      var o = this.hpClass[c] = {};
-      for (var key in this.hardpoints) {
-        var data = filter(this.hardpoints[key], c, c ? 1 : 0, this.mass);
-        if (data.length) {  // If group is not empty
-          o[key] = data;
-        }
-      }
-    }
-    return this.hpClass[c];
-  };
-
-  ComponentSet.prototype.getInts = function(c) {
-    if (!this.intClass[c]) {
-      var o = this.intClass[c] = {};
-      for (var key in this.internal) {
-        var data = filter(this.internal[key], c, 0, this.mass);
-        if (data.length) {  // If group is not empty
-          o[key] = data;
-        }
-      }
-    }
-    return this.intClass[c];
-  };
-
   return ComponentSet;
 
 }]);
diff --git a/app/js/shipyard/factory-ship.js b/app/js/shipyard/factory-ship.js
index f930ee70..dc0b10ec 100755
--- a/app/js/shipyard/factory-ship.js
+++ b/app/js/shipyard/factory-ship.js
@@ -36,7 +36,11 @@ angular.module('shipyard').factory('Ship', ['Components', 'calcShieldStrength',
       var slotGroup = slots[slotType];
       var group = this[slotType] = [];   // Initialize Slot group (Common, Hardpoints, Internal)
       for (var i = 0; i < slotGroup.length; i++) {
-        group.push({ id: null, c: null, incCost: true, maxClass: slotGroup[i] });
+        if (typeof slotGroup[i] == 'object') {
+          group.push({ id: null, c: null, incCost: true, maxClass: slotGroup[i].class, eligible: slotGroup[i].eligible });
+        } else {
+          group.push({ id: null, c: null, incCost: true, maxClass: slotGroup[i] });
+        }
       }
     }
     // Make a Ship 'slot'/item similar to other slots
diff --git a/app/js/shipyard/service-components.js b/app/js/shipyard/service-components.js
index b5e8847a..2a387c68 100755
--- a/app/js/shipyard/service-components.js
+++ b/app/js/shipyard/service-components.js
@@ -90,7 +90,8 @@ angular.module('shipyard').service('Components', ['lodash', 'ComponentsDB', 'Shi
    */
   this.forShip = function(shipId) {
     var ship = Ships[shipId];
-    return new ComponentSet(C, ship.minMassFilter || ship.properties.hullMass + 5, ship.slots.common, ship.slots.internal[0], ship.slots.hardpoints[0]);
+    var maxInternal = isNaN(ship.slots.internal[0]) ? ship.slots.internal[0].class : ship.slots.internal[0];
+    return new ComponentSet(C, ship.minMassFilter || ship.properties.hullMass + 5, ship.slots.common, maxInternal, ship.slots.hardpoints[0]);
   };
 
 }]);
diff --git a/app/views/page-outfit.html b/app/views/page-outfit.html
index a4379dd8..faf4f282 100644
--- a/app/views/page-outfit.html
+++ b/app/views/page-outfit.html
@@ -187,7 +187,7 @@
     <div class="slot" ng-repeat="i in ship.internal" ng-click="selectSlot($event, i)" context-menu="select('i', i, $event, 'empty')" ng-class="{selected: selectedSlot==i}">
       <div slot-internal class="details" slot="i" lbl="GMAP[i.c.grp]" fuel="ship.fuelCapacity"></div>
       <div class="select" ng-if="selectedSlot==i" ng-click="select('i',i,$event)">
-        <div component-select s="i" groups="availCS.getInts(i.maxClass)"></div>
+        <div component-select s="i" groups="availCS.getInts(i.maxClass, i.eligible)"></div>
       </div>
     </div>
   </div>
diff --git a/data/ships/orca.json b/data/ships/orca.json
index ff3a11ba..17b076fa 100755
--- a/data/ships/orca.json
+++ b/data/ships/orca.json
@@ -35,8 +35,8 @@
         0
       ],
       "internal": [
-        6,
-        5,
+        { "class": 6, "eligible": { "Cargo Rack": 1, "Hull Reinforcement Package": 1 } },
+        { "class": 5, "eligible": { "Cargo Rack": 1, "Hull Reinforcement Package": 1 } },
         5,
         5,
         4,