Here are my measurements of the head-to-head distances of the Receiver Locks that we sell:

Receiver Pin Lengths:

TM-T3 = 2-3/4″

TM-T5 = 3-3/8″

TM-SXT5 = 3-3/8″

TM-TR200 = 3-7/8″

TM-TBB4 = 4-1/4″

MA-1467 = 2-3/4″

MA-1469 = 3-1/4″

MA-1470 = 2-7/8″

MA-1473 = 2-3/4″

MA-1480 = 2-3/4″

MA-1465 = 3-3/8″

MA-1495 = 3-1/4″

MA-2866 = 2-3/4″

AN-3492 = 3-1/4″

Pin/Clip = 3-1/2″

TM-T6 = 5-1/2″