2nd Air Injector QUESTION

tried to do the uni mod and broke one of the three tabs of the top of the assembly (the part that the screw goes into). can someone help me find a replacement part/number? i attached a picture of it. i think it should be okay because it still sits on there just fine, but i'm a little ocd. thanks in advance.

 

If you are looking for the piece that the actual Uni Filter goes on to, I haven’t found a part number for it alone. I’ve only found a part number for the whole Air Pump, the Cover , and The Bracket.

The Pump is fairly expensive, I’d probably let it ride and keep a check on it.
Or find a used pump and swap the top?