1981 chassis
From no 5 crossmember bracket tapers full depth of chassis at back
3 1/2 inches at top
3 1/4 inches at bottom
At front is only 1 1/4 deep.
And is 7 7/8 from crossmember.
Bracket flat is 1 1/2 inches from chassis
Bracket depth is 3 1/4 inches
Two steel dowels protrude in...
There's quite a bit more to it, there a relay for the brake lights ,a second indicator relay, and a good chunk of wiring loom. As well as the other side of the panel and the plastic...