1978 55hp piston

[opus215]

I'm rebuilding a model 55875S,Ser # E0005993. One piston is shot. I ordered rings for the good piston, fit is perfect. I ordered a Wiseco 33125PS replacement, not even close the piston is .010 undersize, has a 3/4 in hole in the skirt, and a slight dome. The original piston is flat topped, no skirt hole, and larger port cutouts. Every microfiche I've looked at shows the Wiesco version. Is there some weird model with a solid skirt, or would the OEM part # 0392486 be correct?

[boats.net]

Not familiar with Wiseco pistons, I only use the OEM and haven't had any problems with them.