That's the same one that I have. Not easy to find at a reasonable price. I've seen them in the poly and they are expensive imo.
http://www.manciniracing.com/maratrmo3.html
Just make sure they give you the right one. Take your old one along. On the '66 and up, the bracket comes under the rubber block a little more. The two almost look the same.Wow . thanks they're about 15 miles from me! what's another hundred dollars thanks
http://m.ebay.com/itm/1962-63-64-65...6-Cylinder-NOS-MoPar-/141059744945?nav=SEARCHI looked I didn't come across one on eBay hmmm