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I am looking for 1 rear brake cylinder piston for the M38..

There were 3 different rear wheel 3/4" ID cylinders used on the M38.

Bendix PN 302094 ORD# 7697455 (Superseded by ORD# 8328443)
Used piston PN FC8778 ORD# 7372361

Wagner PN FD13093B ORD# 7697455 (Superseded by ORD# 8328443)
Used piston PN FC8778 ORD# 7372361

Wagner PN FD16535 ORD# 8328443
Uses piston PN FC16536 ORD# 8328445

I put a NOS one on on that has the piston with the ears and the kids were playing in my jeep and before I had a chance to put the shoes on.It popped out and I stepped on it and broke one of the ears off.I have a couple of the later ones with no ears but I hate to throw away a new cylinder.