The LH side socket is the same as 64 thru 66 and 68, the RH socket is the same as 68 which should broaden your search.
Jim
Depends upon what you mean by "socket" and associated wiring. The lamp housing on both the left and right are the same as 64 through 66, but in 67, the wiring stopped being integral and was instead a male/female bullet connector a few inches away from the lamp housing. The RH side bracket is the same as earlier years, but the LH bracket is different from the RH.
I have a couple of the lamp housings and wiring for a 67; the housings are not perfect in terms of finish, but are fully functional. I have the RH bracket and only a portion of the LH bracket. PM me if you are interested.