AC compressor mount
Looks very similar to the custom bracket I fabb'ed for the same spot. Post 22 in:
Air conditioning options?
Not super confident in my bracket since one custom Sanden bracket I used on my 1985 M-B 300D, made by a forum member got cracks. I didn't see anything he did wrong, but might have experienced a resonance at certain rpm's. I haven't run the compressor in my 1964 Valiant, so can't comment.