Anyone know where I can get a bimini for a 1990 35? The boat must have come with one originally, rails already on boat. Any suggestions appreciated.

There are many places to order "standard" bimini tops... boatersworld, overtons, west marine, the list goes on.... You'll pay a bit more going to a custom place. Do you want the side curtains is a question that will determine where you will go. The places above won't help you out with the side curtains. For the side curtains you'll need to go to a custom shop or contact SonicUSA....

If you just want the top fabric(no side curtains/clear plastic to totally enclose you) I would go into West Marine or Boaters World.

Sonic has made it very easy with the standard rails. Pic below where the red and blue cylinder type pads are.

I was at Boaters World and they had ones in stock, sunbrella and vinyl fabric, that the frame attached right to the rails Sonic puts on. No stinking drilling in the boat. Nice and easy.

The ones that I had seen were all 6 feet front to back and adjustable height and adjustable width.