What are the differences between 68 trim rings and 65-67 rings?
I have several of what I've identified as 65-67 rings and none have any identification markings. Two do have what appears to be small "stops" or "steps" on the inside that might have been used to aid in mounting the rings to the housings, or possibly part of the casting process. Is the lack of markings significant, as in Ford's suppliers didn't mark them, or are these reproductions?
Ref
http://www.concoursmustang.com/forum/index.php?topic=13949.msg86524#msg86524 Scott Drake repros are identified on this post, others appear to be without ID.
NPD and the MPC (Ford Car Parts) have different part numbers for 65-67 and 68, Virginia Mustang has the same stock number for 65-68 trim rings. (Yes, the housings are different for 65-67 and 68.)
Jim