The Stovebolt Site Forums The Parking Lot Tons 'o Fun 7.00-18 tires

My 1959 38 flatbed needs 2 tires and I have found an individual with 8 never mounted 7.00-18 bias ply tires at a very good price. Should I be concerned about the tires having the correct tire-to-rim lip to fit my original split ring wheels? I understand tires may have either a 5 or 15 degree mountng lip. It is important to gather as much information as possible in advance since I will be driving almost 200 miles round trip to get the tires and I sure don't want to buy tires I can't use.

Thanks,
Steve