Hard to find Buick part

Hi guys, I have a 1971 Buick Skylark Custom that I rebuilt the transmission and the 350 engine in. I have to replace my detent cable that was bad but can't find the original part anywhere. Aftermarket cables don't fit due to my cable connecting from the transmission to the gas pedal unlike the aftermarket ones that connect to the carburetor. Does anyone know where I could get this cable or have an extra one lying around lol. I have tried all the known sites like OPGI, Summit, YearOne, etc to no avail.