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Not Mills, but I got a 3 bow, 6 footer on my 21... The other option was a 4 bow, 8 footer...

I have a 6 footer on my Grady White 19 as well...

I think a 4 footer would be OK for the driver, but nobody else... That's pretty small...

And BTW, for the price of that Mills 4 footer you can get a whole lot of bimini from anyone else! But to each his own... Mine from iboats cost like $350, free shipping I think, 6' long... Sunbrella... Aluminum poles, not stainless... Stainless is heavy, remember that...