On early (pre-'81) boats, make sure it has be retrofitted with the shroud plates that bolt into the hull just beneath the flange. Otherwise, you will be pulling the deck off the hull one fine day. Been there, done that!

I think Hobie did run a free-retrofit kit at one time...contact a dealer to see if you can get the plates if needed. Retail price is quite steep for all 4 or 6 plates (two per beam (both fore & aft?), two for the shrouds.