KZ750 cam end caps

1981 Kawasaki KZ750H LTD(4)

I went to check my valve clearance on the bike today and decided it would be a good time to reseal the cam end caps that were weeping. I got everything off and the cover removed, valves clearances are within spec and all is happy. I go to pull the end caps and one by one the outer plastic snaps, leaving bits of plastic on the sealing surface and ridge. I don’t want to deal with the leaking or the breaking again, I know the Z1000/900 has an aftermarket aluminum set but I cannot find one that uses the o ring to seal for a 750/650. Can anyone point me in the right direction? 

original part number:
92066-1111

OEM  Caps:

 

Buy new OEM plugs.  Coat the curved area with RTV or threebond acrylic sealer before install.  There is no need to reinvent the wheel.

Alright, seems simple enough.
I’ve paid partzilla $60 to have them by Thursday at the latest and Wednesday at the earliest.