I did the Detroit Steel wheels on my wagon. 18". I had to get Detroit steel to send the rears to Weldcraft to get them widened. I got 18 x 9 with 3.75 BS and had Weldcraft put an inch on back side to give me 4.75 BS. I am real happy with them. I had baby moons on but liked the bare black wheel better.
check out Wheel Vintiques. They have 15 x10 steel wheels. I have dog dish caps on mine and use there 15 x 5 on front, Had my 15x10 custom made for back spacing I needed at Stockton wheel. Not sure if they are still in business but they have them also if still open.