Here is an Onan Standard Piston & Pin & Clips 112-0184 OEM NEW NIB NOS. Box shows shelf wear.  Acquired from Military Surplus Sale.
Onan 112-0184  supercedes/interchangeable with: 112-0177, 112-0127 112-0174,112-74,112A74. 
.  Casting # 112-0155.
Interchangeable with: 2805-00-594-9612(NSN).

Please see ALL my ONAN parts for Sale
Made in U.S.A.

Ref- Tab.  Loc-Tent.