I'm working on installing a mid 1960's Saginaw OD version transmission into my 1950 GMC. The reverse light switch does work, but the pigtail does not. Does anyone know of a source for this pigtail?

Thanks!
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IMG_0190.JPEG (271.77 KB, 88 downloads)

1950 GMC 100 Panel Truck, 1958 270,
3-spd Saginaw with BW OD,
3.73 12 Bolt Differential from a 1966 C10,
Front Disc Brakes
Hill Holder
Bought it in pieces 9-1976, driving since 6-1978
Follow in the DITY