Many years ago I was looking for parts for my dad's. And there is a guy. Who is an IVES guy. And said York. That mth sold the parts there. Since I'm 3000 miles from York never got there.
But I did pick a frame up from Brian Wilson. EBay.
His site was auctions on main. Think Tennessee.
Armature Bob hannon had on his eBay site. If you get that far. He might have an armature.