[TA455HO]

Notice how this is "LS5 ONLY".

One clip is pointed to as number 20 in the parts listing. That is the rear clip and looks like Chris's (where did you get that one Chris?).

Then look for the "EXISTING BOLT & WASHER" text and follow the two lines from it and you should be able to make out the front and rear one. Here are the individual part numbers. Somewhere on here someone had a broken motor mount but it still had the clips intact and it was a decent picture of some real ones. Front one had a definite distinctly different shape to it, thus the reason for two part numbers.

20 478655 2.343 All A & F/455 H.O. CLIP, cable to eng. mtg.-rear 1 1971 1972 2-23
21 481216 2.343 All A & F/455 H.O. CLIP, cable to eng. mtg.-front 1 1971 1972 2-23