I think you're talking about the STC/Kayline top, the Canback tops come with a bolt-in rail that mounts in the factory top holes and then the snaps mount to the rail.


'87 4-Runner--DD/wheeler, 4.3 swap coming soon
'89 Supra--E85 powered 2jz NA-T Swap, 533rwhp 497ft-lbs
'89 Festiva, turboed BP swap powered by megasquirt