Have noted several posts on changing bolt patterns to five lug on a six lug rear or to six lug on a five lug rear end or bolt circle sizes. This usually comes up when a front end is changed to A-frame type or rear to an open driveshaft. I am getting my 37 Buick ready for the AACA annual Bug Tussle Trek (big in the northern part of Texas) and with a brand new engine I didn't want to keep the 4.44 factory gears. Four dollar gas is also a factor. I could have used the Bridgeport mill and an index table but decided to try it with tools the hobbiest either has or can get at the local Home Depot. If your lucky your new wheel will fit the axle pilot tight (I wasn't). If not, first use a wheel with the bolt pattern you want and one that has a center pilot hole that is too big; a "white spoke" painted wheel has a big pilot hole no matter what the bolt pattern is. Make a bushing (on any home wood lathe) that fits tight on the axle pilot and tight in the wheel center. This is the yellowish colored ring in the center of the wheel in the picture. Now get a short pipe nipple that the OD fits the lug bolt hole in the wheel and a drill bit that fits inside the nipple, you may have to drill it through. This will keep your drill from walking off center. After drilling with this bit you can enlarge to the size of the shoulder of the lug bolt your using and draw it through the axle with a lug nut, washers, and a smear of anti sieze. This drills the axle and brake drum in one operation. Buick had lug bolts instead of lug nuts so I drilled and tapped the axle flange. The tire has virtually no run out.