Didn't get any posts on other forum--So I'll try here--I have a 20hp.Mariner OB that I'd like to crank,but the inlet isn't round will round ones work??Plus it's right on top of cav.plate,so I thought maybe it's due to the age,it's a 1976(I think)Guess they were rectangle back then. If you have an idea,I'd love to hear it.thax,dude11