diff --git a/src/js/itemAvailability.js b/src/js/itemAvailability.js
index 26237b5bdbee7de65933c9ed4c769c807098991a..b70979fde292371e8f3421b07944bfc2a88b69c2 100644
--- a/src/js/itemAvailability.js
+++ b/src/js/itemAvailability.js
@@ -188,3 +188,46 @@ window.addProsthetic = function(slave, prosthetic) {
 		slave.readyProsthetics.push({id: prosthetic});
 	}
 };
+
+/**
+ * @param {string} prosthetic
+ * @returns {number}
+ */
+window.prostheticToLimb = function(prosthetic) {
+	switch (prosthetic) {
+		case "basicL":
+			return 2;
+		case "sexL":
+			return 3;
+		case "beautyL":
+			return 4;
+		case "combatL":
+			return 5;
+		case "cyberneticL":
+			return 6;
+		default:
+			return 0;
+	}
+};
+
+/**
+ *
+ * @param {number} limb
+ * @returns {string}
+ */
+window.limbToProsthetic = function(limb) {
+	switch (limb) {
+		case 2:
+			return "basicL";
+		case 3:
+			return "sexL";
+		case 4:
+			return "beautyL";
+		case 5:
+			return "combatL";
+		case 6:
+			return "cyberneticL";
+		default:
+			return "";
+	}
+};