I have a '57 6400 grain truck. All the tires are 8.25 - 20. Someone local is selling some 9 - 20. Does anyone know if this size would fit my existing rims OK. 2nd question: Unfortunately I believe my truck has split rims. I found one guy who would mount the two better tires I got with the truck. He charged a lot but I figured it was worth it. The tires for sale look like split rims too, but the rims are 10 lug. My truck is 6 lug. Any estimates or ideas on how I could find 6 lug wheels that arn't split rim to fit this truck? My financial situation is such that I cannot buy new rims anyway. Thanks for any help.