Finding a 57 inch driveshaft with the correct yoke on both ends will be like finding a 32 ford with chevy motor mounts that were factory installed by ford.... not saying that there is no chance but saying "little chance"

A new driveshaft, measured and built properly, is the best way to go and it isnt that expensive. Anything you find in a "previously owned recycle emporium" is going to be suspect anyway.