On a '53 both the SRW and DRW have 5.00" offset even though the part numbers are different on the wheels. No sure why that is. The DRW 17.5s have 4.75" offset and the same coined mounting. They work on SRW and DRW '53/'54s. In 1955 the SRWs were changed and have only 1/2" offset iirc. Stu