Brand new, never used, in original package, NOS Genuine GM rocker arm.  GM #1234503 PG #0.333.  evidently fits the 'left' side of the motor (for intake valves on cyliders 2, 3, 6, & 7 & exhaust valves on cyliders 1, 4, 5, & 8.  The item in the pic is the item you will receive.   

Per my research below, this rocker arm will fit the models listed below with any V8 engine.  May fit additionl makes/models/years too:

1970 WILDCAT
1970-1972 BUICK GRAN SPORT
1970-1972 SPORTWAGON
1970-1972 ELECTRA
1970-1972 ESTATE WAGON
1970-1972 RIVIERA
1970-1972 SKYLARK
1971-1972 CENTURION 

I am not an expert on this part.  Please confirm compatibility for your inteded application and ask any questions before buying. 

I bought a bunch of NOS Ford Lincoln Mercury Pontiac Cheverolet GM parts recently.  See my other items for more NOS parts.

Thank you for looking!

1970 1971 1972 70 71 72