These are the ones your looking for
http://www.ebay.com/itm/NOS-67-71-Ch...e80fe2&vxp=mtr
but used ones I can find for 50-75.00 or less. Check the classifieds here under 67-72 trucks, might find something. I've never used the 1972 up mounts, maybe someone else ?
Early Classics sells the rubber mounts here
http://www.earlyclassic.com/catalog.aspx and I'm sure there are other vendors and prices. The same 68-71 PS hoses work well, they reproduce most of the brackets now I see. Check local guys into 67-72s, its out there.