You're better off having one made up locally at a powertrain shop...Take some measurements and you'll have a shaft made up for exactly what you need for your car...There's way too many factors involved to just buy a used driveshaft and hope it works..At this point there's no reason to worry about an original unit there obviously was'nt any for 74...If the one you have is too long you could even have that one cut down and rebalanced... That would be the cheapest way out of all the options...