Oil injector pump rebuild kit 1991 Trail Boss

The oil injector pump is leaking from the top plate which is held down by 4 screws. I removed the cover plate, the gasket was deteriorated and a small piece fell out. The piece that fell out is a small brass kind of round T shape. I am unable to locate an injector pump rebuild kit and I am checking to see where this goes in the pump.
I am installing the engine after an upper rebuild. I did not have the atv long before having to do the rebuild and am thinking if the pump was not operating properly that may be the reason the rings were ruined and the cylinder was damaged. The outer screw on top will not turn and I did not try to put too much pressure on it if this is not meant to be removed. I was thinking about removing the pump all together and doing a pre mix however the pump phillip screw heads are rounded which is another red flag that the pump had been taken off previously. So kind of in a holding pattern until I figure out how to put the pump back together and try to test it after that. I am planning to make a gasket with Permatex blue rtv.
Any assistance or ideas would be great.

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