If the welded spring doesn't work out... the guys who work with the old cars have parts stashes, too.
Try Dr. Benz, Dan, at the Benz Barn in Michigan, he might have some leads on an old axle or parts. He specializes in restorations and also distributor rebuilds. His number should still be (877) 661-6061.
You might also look up Joe Alexander in Blacklick, OH. He may very likely also have a front subframe with parts.
Email:
ja17@att.net
Phone: 614 751-8262
Good luck.