On the first one we had the metal laying around and it was kind of an odd ball size. However, for the second one we bought 2" thick cold roll 9" wide by 10-1_2" tall. You have to drill 9 holes, 6 clearance and 3 tapped. We had a local machine shop do the work. We have the 7-1_2" axle spacers up front that normally are used for duals, then we set the rear tires in the middle of the track. If you don't space out the front axle you will probably have clearance problems or be running outside the front tracks. I will pull the info together and send you an email at the new address. Mike