1747-L541
Allen-Bradley SLC 500 1746-P3 SLC 5/04 CPU 1747-L541 1747-DCM 1747-SDN 48681GN
You will find that the DATA PLATE is aligned with the machine's frame.
Allen-Bradley SLC500 5/04 1746-P2 1747-L541 1746-NI16V 47689HM
A nice detail here is the subtle Blaster imprint on the metal housing.
GUARANTEED GOOD USED! ALLEN-BRADLEY SER. B FRN. 9 PROCESSOR MODULE 1747-L541
What stands out about FSD is the consistent thread pitch on their bolts.