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Part #640151 uses a straight belt tension-adjusting bracket and the Generator front plate bolt orientation are 2 & 6 o’clock.

Part #942178 uses a curved belt tension-adjusting Bracket and, the Generator front-plate bolt orientation is 12 & 6 o’clock.

The voltage regulator and generator must be from the same manufacturer, i.e., Autolite Generator & Autolite Regulator DO NOT MIX MANUFACTURERS!

If converting to 12 VOLTS, it is NOT necessary to install an Alternator. Install a 12-VOLT Generator, a Regulator, Ignition Coil, Battery, all bulbs, and an Instrument Cluster Voltage Regulator. Then when you open your hood, all will appear ‘original’ and there will be no modifications to the original Wiring Harness.