Originally Posted by CrankyD
Looks like a Bestop for factory style hardware to me. The supertop frame is round section tubing at the doors and the fabric wraps around with velcro. Are the door corners Square? If they are then you have YJ factory style frame hardware. Check the link SLO Ken posted.
Look at step 16 in the attached Supertop installation guide for 76-83 CJ5's. It sure looks like the OP's photo to me...
edit: The round section tubing and velcro fastener you are thinking of are on the CJ7 model Supertop with soft doors. OP has a CJ5