In 66 they started using the 1 stud mount .it interchanges with the earlier mount and can be had from most good auto parts stores.I bought one a year or so ago and put it in my 65 Valiant wagon .The 4 speed ,3 speed ,and automatic all use the same mount
https://www.napaonline.com/en/p/BK_...ressionRank=1&keywordInput=transmission+mount
