Velcro! The whole top was held on with Velcro. There was a flexible fiberglass strip that went around the b-piller and bolted in to the factory holes. It had a single snap in the center to center the top. The rest of it was lined with Velcro. I was mistaken about the side rails. No snaps, just Velcro. They were fabricated of aluminum angle, 1 x 2 I believe. The 2" side mounted to the bed rails, the 1" side was sticking up and the outer side was lined with Velcro. The pockets for the wooden bows were separate pieces. They mounted to the inside of the bed rails with sheet metal screws. The factory sent a roll of Velcro to line the edge of the tailgate. The trick part is that you had an adjustable bar that mounted inside the cab. This bar was the same kind that trucking companies use to secure loads inside the trailer. Large feet on either end and you would twist the bar to make it longer or shorter. It attached to the top at the seam directly under the rear window, where the top makes it's horizontal turn. Again, Velcro loops were used. This top was very secure, not problems doing 75 on the highway. Having the cab bar tight was the trick to keeping everything together. If you would like me to sketch it out, send me a pm. I'll have to txt it to you.
