Hey Bill, my Son and I have a little cash on the side bogus business Dream Build Fab making up custom steel wheels, basically give us your old steel rims and we turn them into any size and back space you like.
The rims in the pic are 1969(aussie chrysler) 14" centres, 15x8 outer band that is flipped, close to 5" backspace and a 16" fake beadlock The beadlock actually works as the bead is on the 15 plus hard against the 16 lock, tire must be fitted from the back .

https://www.facebook.com/Dream-Build-Fabrication-118542518695958/