Ah! I didn't see it!.....I'm gonna try and attach a picture here,...I'm pretty sure this is the one I need, any thoughts anyone? I've got the Mast head in my hands, that's what I'm measuring from. I'm on a 77 S2 8.0, I thought it was maybe a Dywer mast but again I can't find solid info on it anywhere..I know every other spec, just not that one! Lol!! Thanks in advance.