I had the same problem. after 1/2 day I got them installed.
After one weekend at the darg strip they melted at the passenger side.
(some inches away from the headers). Right now I am running only one at the
driver side. Would never buy them again. I think the HD from Mancini are
a better option. Personally I would not use any tranny mounts in PU
unless your chassis is ultra stiff. I would be afriad to brake the trannys neck.