That PN is discontinued per THIS. But you can determine if it is for a 12V or 6V by counting teeth. HERE's a good resource. Also count the number of clutch pressure plate bolt holes. A standard clutch would use 6 bolts and a heavy duty clutch (11" disk) would use 9 bolts.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.