i would just fork out the cash and get a new one for over 200$, i was hesitant to buy mine because it seemed like too much. all it was going to do was help with vibrations.
but i finally forked over the cash and got one, and it was one of the BEST investments i have made in my car. it completly took my vibrations away, COMPLETELY with a 3.90 gear and with a short throw i cant feel anything.
you used to be able to get them cheaper but not now. i would just get one new. that way u know it will work. you take a chance buying them used, you never know what happened to something you buy use so your taking a chance.
buying it new its already assembled and all u need to do is take it out of the box and put it in.