340 K Member ??

Sounds like a plan, let's see if we can make a spread sheet type document (oooh, almost sounds like working in an office) and see if there's a common denominator. Let's break it out something like this:

Year and model, transmission type, brakes - disc or drum, sway bar, torque boxes - front, rear or all 4 and finally if it has the welded on washer.

'70 340 Swinger, 4 spd, disc, sway bar, front torque boxes, with washer
'72 340 Swinger, auto, drums, sway bar, 4 torque boxes, with washer