Long story short i need to know what bushing this is on my FC so i can buy a new one or new kit. If anyone could tell me what its called or where to get it from i would greatly appreciate it. Thanks guys.

It would be the lower right one in this picture. Where there is no rubber bushing in it now. Its where the lower part of the rear trailing arm connects.



Here is another shot:

 

Check the parts or maintenance manuals. They can be download from
Foxed.ca - Mazda RX-7 Manuals

 

that's the DTSS bushing. Most people just get rid of it anyway by putting a solid bushing in it's place.

RX7 1986-1992: Suspension - Components: Rear Susp Upright Toe Eliminator - 86-92 RX-7 -

 

Thanks guys. Exactly what i needed. Much appricated