That is almost correct:
- the front and rear bumpers on a 1-ton panel-body are the same
- the front and rear bumpers on a 1-ton pickup would indeed be different because GM apparently did not sell a rear bumper (did you find a part number for a rear bumper?)
1929-1957 Master Parts Book (SGL. UNIT indicates Panel body trucks)
What parts book are you referring to?
Pickup
- front = 3700437/painted (3683347/chromed)
- rear = no rear bumper listed?
Panel
front = 3700437 (3683347/chromed)
rear = 3700437 (3673347/chromed)
