The M-124 Weight Bar bushing is welded in the front weight bar of a funny car for the attaching bolts to go through. You need 2 pcs per weight bar. The bushing is made from 3/4" RD 4130 steel and measures 1/2" I.D., 11/16" O.D., and length is 2 3/8". There is a pdf chart that may be downloaded from our website, http://mckinneycorp.com/downloads/pdf/bushing.pdf, that will give you a list of some of the bushings that we carry. Should you not be able to find the bushing that you're looking for, call and we'll be happy to assist you in finding what you need.