You can't tell by picture the difference between B body and 70up E body mounts. You have to do a measurement. Al, can walk you through it. But basically for the Passenger side mount run a straight edge across the bottom edge of the two engine side holes with the insulator side on a flat table. Measure the height of the straight edge. 2 1/2" is B, 2 1/4" is E body.

For the driver side place a large drill bit through the engine side hole that goes closest to the insulator hole on the bottom. Going from center of drill bit to center of the insulator hole a B body gap is 5/8" and the E body is 7/8". I also believe Al use a measurement of the side gap.

Basically a subtle difference between an E and B body.

66-67B bracket had square cut corners and 68 and up B has rounder corners.