I own a 72 Winnebago on a Dodge M500 chassis that currently had 17" split ring 5 lug rims. I've been told that the only replacement is to find another Dodge chassis RV, international loadstar, or older Dodge heavy duty truck that has 19.5" rims. If anyone has some they are willing to sell me or know of a salvage yard please contact me at 706-664-7915, call or text is fine.