diff --git a/strange_eons_to_arkhamdb.js b/strange_eons_to_arkhamdb.js
index 6727b95..2f1f64f 100644
--- a/strange_eons_to_arkhamdb.js
+++ b/strange_eons_to_arkhamdb.js
@@ -1,5 +1,5 @@
 // TODO: should be defined in strange eons somewhere
-const pack_code = "420";
+const pack_code = "42";
 
 function renameSlot(slot) {
   if (slot.startsWith('1 ')) {
@@ -76,6 +76,10 @@ function int_or_null(inp) {
   }
 }
 
+function leftPad(str, len, fill) {
+  return fill.repeat(Math.max(len - str.length, 0)) + str;
+}
+
 function build_card(component) {
   function substitute_tags(str) {
     str = str.replace("<fullname>", String(component.getName()));
@@ -86,7 +90,7 @@ function build_card(component) {
     return str;
   }
 
-  var code = pack_code + component.settings.get('CollectionNumber');
+  var code = pack_code + leftPad(String(component.settings.get('CollectionNumber')), 3, '0');
 
   var card_data = {
     code: String(code),