Brake Booster Firewall Plate
$29 Shipped by itself or $20 with kit. May lower that price for kit.
This will make mounting an aftermarket or s10 booster much easier. Put the plate on outside of firewall, mark holes and drill. Then weld this plate inside firewall. S10 boosters are slightly different than aftermarket, so that is why there is a slotted hole in one side.
Measures almost 8x9" and is 11g steel.
Made to order, but should be stocking these soon.