ISX 12 CM2250 parts in pan!

[imalumberjack]

   I bought a 2013 pete with ISX 12 at auction ..non running truck. Got it home and found it had ate the high pressure fuel pump (ceramic plungers) right now I am inspecting as to whether its repairable. Dropped the pan today and found parts in there :-( I have attached a picture (at least if I'm doing this right). basically it appears to be similar to a washer the size of a dime ..its in four pieces, looking closely it looks like its a casting? rough edges on inside edge? and a small back plastic piece? rectangle with half moon on one side? Hoping someone can identify from pic.
Thx