Looking for 4 nuts that are the larger ones that the pump lines fasten to inside the transom. I purchased new used 280's and they came with 4 larger nuts that were to big. I cked with calipers and the ones I need are .600 inside diameter x 1/4" thick. For some reason the ones that came with mine are closer to .675.

I'd go to local marina to see if they could order however id be there forever and a day trying to explain what I need. Then they'll end up telling me they can't get them. I'm in a bit of a rush.
Tks
John

Depending on what model you have- this may get you started:
http://www.mercruiserparts.com/Show_...+A04%2F+A05%29

http://www.mercruiserparts.com/Show_...2F+845588A2%29

http://www.mercruiserparts.com/Show_...F+846215A02%29

Tks mike I cked that earlier before posting and nothing looked right on either site. The .625 nut that it thought it might be said it required 8 for installation with left and right tab. Only require 4 so it didn't end up being the right one. Think it was #30 ref part that I needed but unsure. 625-18.

I measured .600 with calipers but???