I Have a 29 with the 31 bracket installed it has been in there for years and works fine. The bracket top attaches behind the removable dash piece where the ventilation holes are using 1/4 inch grade 8 bolts washers and lock washers for strength . I do recall it was necessary to make some angle washers to go under the bracket at the top so it would align with the steering column without binding . I made these from some very tough little square pieces of 3/8 inch thick lexan plastic by holding them up to a grinding wheel and "eyeballing" the angle . After a few tries I got it all to fit fine. The angle washers could also be made from aluminum,steel ,brass or copper whatever is available.
Hope this helps B0B in Michigan