Got a 51 Poncho with a 239 in line six. The mounts on the back of the engine are quite light duty, but the origianl tranny mount was quite substantial. However, I've swapped it out for a T5 and now I seem to get a lot of motor twist as the T5 mount is light as well. Thinking of making new heavier mounts to counter act this, but not sure of what to use for rubbers. What has everyone else used when making them ? And how thick are they ?? Thanks much !!!