I have an good used 86 ESC Module (BLO Sticker on it, instead of the '87 BLM) I got from GBody Parts, and a new 10456287/ACDelco 213-325 knock sensor I got off eBay (still in the box). I replaced many of the other sensors when I rebuilt my engine, but wound up never using these two. PM me your email addy and I can send pix if you're interested.
John A, Turbohh