The transmission in 1986-1999 Softail is mounted to the frame with 4 studs on a mounting plate and on the right side with the 5th stud straight onto a bracket that is welded to the frame. It is common practice to offset the transmission to create space for a wider rear tire, using an offset mounting plate. The offset mounting plate however does not take care of the 5th stud, often resulting in a cracked inner primary. Installation of our "Fifth Brace" overcomes this problem. Installation is simple. All bolts, nuts, spacers, washers and a comprehensive instruction is included. All you have to do is drill a 3/8" hole in the vertical part of the bracket on your frame, put "The Fifth Brace" on it and then bolt that bracket straight onto the trapdoor. The result is a more torsion resistant and stronger-than-stock construction that drastically reduces the chance of a cracked inner primary. Fits stock and most aftermarket frames.