78-9541 B Needle Valves

Highboy34

Senior Member
Rummaging around today I found a Ford box of NOS 78-9541B carb needle valves. I checked my 28-37 Chassis Parts List and it only lists 78-9541....no B shown. The Green Bible was the same. Charlie, Max, Bruce........anyone know what these fit?
 
If I'm not wrong, one has the screwdriver slot and the other just has a slash mark on one side of the head. Same threads and taper.
 
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