Spare Ballast Resistor

Hi guys. Taking the Dart to Carlisle in a couple weeks so I'm lining my ducks up.

My car was converted to MP electronic ignition last fall. I need a 4 wire ballast resistor to keep in the glove box in case I need to replace it on the road. What year/type car should I order it for, and where should I get it??

1969 Dart with 340/727

Thanks in advance,
George
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