1967 Disk Brakes conversion, 14" wheel rim back set? in Buick - Post War - Technical Posted December 31, 2013 I am converting my 67 GS 400 to disk brakes on the front and not sure the stock chrome 14" wheels with drum brakes will work with the back set on disk brakes. Any one have experience with this. I have heard I might have to use 69-72 Chevelle wheels which were 14" with disk brakes. While I can buy new 14" OEM wheel copies from OPGI in either 6" x 14 with 3.5" back set or 7" x 14 with 4.15" back set not sure either of these work. Thanks in advance for any advice.