I think they stop to use it in erliers to mids 80s ?... when cars began to be FWD dunno

Bouchillion got them new in $112 ( ouch!!! )
http://www.bpeusa.com/BPE2218.asp


but just in case:
http://www.ebay.com/itm/Mopar-1967-and-U...a91&vxp=mtr

kits available everywhere

With a Charger born in Chrysler assembly plant in Valencia, Venezuela