i'll throw this out there just to spite the poverty boaters thread. i bought this bimini on ebay for $128 shipped. easy to assemble. bomb proof in wind. great coverage. it can also fold down completely flat on the frame.
3 bow = 6', 4 bow = 8' typically.... it's the number of bows holding the cloth part up...
The fittings are the pieces that hold the bows together and mount it to the deck.
I wouldn't change all the fittings right off. My old bimini was 20+ years old, used it 5 years on the raft and one finally broke towards the end (obviously had nylon fittings). Just buy a couple spares (might as well be SS) for the patch kit just in case. I'm sure others have valid reasons but I'll wait to replace mine until (probably if) they ever need it. I would probably change the deck mount fitting to a SS. When convenient, then keep the nylon ones as spares
You could get one that worked for both, but it would likely run on the narrow side for the bigger boat... I imagine it would simply add sellability to your current boat down the road and you won't be into that much $...
Mountain Buzz - rpludwig's Album: wet fun - Picture
Has been on the boat for two years, sew the tarp and bend the EMT. Drill the holes and use some hose clamps and conduit mounting brackets and boom, totally stable in wind and collapses easy.