This is a motorsport solid transmission mount. When installing are you supposed to use one or two?

 

JC,
I'm pretty sure that is a Club Sport motor mount and you need 2. CS motor mounts are hard rubber but not as hard as the solid full race motor mount. I may be wrong as I did not see the CS mounts before they put them on my car. By the way, the CS mounts work fine for city driving. dont really notice more vibrations. However solid mounts (race) will rattle your fillings

 

This one is definately solid, made of very hard plastic. I'm wondering if there are supposed to be two to replace the big rubber mount.

 

Guys......that isnt a 993/964 RS engine mount nor is it a 993/964RS transmission mount. It looks like kind of sorta like the 4 engine cradle mounts for the entire rear e/engine subframe of a 993. What is it and where did you get it.