All the snaps I've seen were on the body. On aftermarket and YJ tops a rail bolts to the top of the tub where it angles, and then a strip slides under that rail which holds it in place. It is much cleaner looking, better, but not oiriginal or correct. If you're doing a restoration get a snap on Whitco top. If you're just building a driver get a Bestop Supertop or similar.
85 CJ7 258, borla header, Team Rush, MC2100 ,optima batt, Warn 8274, agr super box 2 & pump, T5 w/ B&M shifter, centerforce 2, superior 1 piece axles, warn hubs 2.5 in lift, 31" BFG MT
85 CJ7 258, A/C, T176, MC2100, Team Rush, Warn XD8000i, superwinch hubs, 3in lift 31" BFG AT/KO