All of the ones I've seen require swapping over the original arm (much like the fan flange when buying an aftermarket water pump). I doubt the arm needs replaced... that's a big-o-hunk of cast metal <img src="/forums/images/graemlins/mrt.gif" alt="" />

Sean Strawmyer
Back and ready to rock...... crawl.

From Indiana or surrounding states and interested in wheelin'? Check out www.mwior.com