Proper Cam Roller ?
 

I bought this cam roller, supposed to be for my motor, doesn't look like what was there it looks too big My motor is a 1995 150 HP Ocean Pro
This roller measures 5/8 O.D. 3/8 High Is this correct ?

I can't find the dimensions but a part #0323326.
Does that help?

I can't remember which engine it was on but the same roller was a 2 piece composition and the outside portion had degraded but not completely fell off.
I'm suspicious that yours may have done the same thing and appears intact but smaller in appearance. The new ones may be one piece.

Yes that is what I believe also, my old one looked skinnier and white, all cracked and missing pieces, there appears to be an o ring on the top of the post I guess I'll try and remove it then reinstall it