I am in the process of converting over to power steering in my SS396. The Saginaw gearbox (5691676) fits, but the tapered end of the pitman arm that came with the gearbox doesn't fit the stock drag link. Can anyone tell me a part number of a pitman arm with close to 1.193 for the splined hole and .640 to .550 for the tapered hole? It is 5" from center to center of the holes. Is there another solution like changing the splined shaft in the gearbox to match the manual gearbox pitman arm?