Purchased this seat for my gas box chopper frame I am nearing the end of building. One of the last pieces before disassembling for paint and final finishing of all parts. I fabricated a front mount that bolts onto the stud the comes with the seat threading into the seat pan, and then my bracket bolts into the back bone of the frame. I then machined a seat but for the rear on my lathe that matches a bunch of other billet aluminum parts I made for this bike. It mounted really easily with a little ingenuity, and really completed the look of my build. Fits the frame width of the hardtail portion of the Gasbox really nicely, and the quality is excellent for the money. Great value, and it is comfortable to sit on. 100 percent recommend a Sullys Custom seat.