Right, but any of those longer driveshafts, including the one you already have, can be cut down to 51.5” for your car.
Drive line services will cut one down, make sure it’s straight and balance it for like $80. I doubt you’ll find one significantly cheaper than that, especially if shipping or traveling is involved. Plus, whatever you find at that price will still be an old used driveshaft that might need to be straightened or balanced.
Just a suggestion, but shortening the one you have would be faster and easier than trying to locate one the right length in good condition in less than a 3 hour drive from your location.