This is one of the original pulleys used in heaps of 66-81 GM Vehicles pretty much across the range.
Picture is correct.
ID's also by the fact it runs a 5.5" wide pulley. ... the alternative size is 5 inch.
These are a USA remanufactured unit .
No exchange needed.
Always have a qualified specialist work on your AC. Check oil levels & lublication before starting.... ALWAYS have the compresser systems switches checked for operation BEFORE starting..
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READ THIS A/C HELP GUIDE. .click this linked guide and it's links.. the bottom line is air conditioning system repairs are simply not for novices..