In 1968 there was a "similar" looking clip used, 382350-S (ref 68 Electrical Manual, AM0023 page 8, item 7, 4 each) from the 69 and on version, 383104-S. I don't know what the differences are.
Jim
On second thought, if you use the 68 type, no question will be asked by a judge about its use. If you use the 69 and on type, you will have to provide documentation including a change over date. The rock and hard spot syndrome.