UPDATE: Any NSR gears are allowed. If you have an older GT3 car that you can make legal for this series – whatever NSR gears you have in it can be used. Whatever pinion and spur diameter (OD) combinations you can make work will be OK.
Required: OEM Pinion: 6.45mm-DIA 11z NSR-6911A (NSR does not have any other 6.45 pinions)
"... get on your bad motor scooter and ride!"
Sammy with Montrose