Finding a rim with 5.5" backspacing

Anyone know of a 15x10 steel rim with 5.5" BS? I'm running a Dana 60 now that has 8 on 6.5 bolt pattern but I would be willing to swap axel shafts to 5 on 4.5 to

I'm running 15x10 4.25 BS and I'm rubbing my fender

tires 295-50-15 tires

Sorry if it's not alowd but this is for my 69 D100