The GasBox DIY sissy bar kits give you all the parts necessary to build and mount a bespoke sissy bar to pretty much any chopper or custom bike. Just cut the loop to the desired length and weld! Kit includes a pre-bent 26" tall sissy bar loop, two mounting tabs, two pre-bent axle plate mounts, two axle plate mounts, and two 5/16"-18 mounting bungs for mounting a fender.

One-piece sissy bars by The GasBox, which are attached to the fender struts. They sport a clean appearance, are quickly installed and just perfect for lashing sleeping bag, blanket or other luggage. This will make your next tour even more relaxed and saddle bags possibly can be left at home.

These uprights are bent from 5/8” round steel bar and feature a more pointed design

Nicely machined lower mounts to build your own design of a sissy bar. Drilled to accept 9/16” tube or rod material which can be welded or brazed in.

Sometimes it's the little things in life that make the difference. Like this inconspicuous T-nut by Bates.
If you want to mount a sissy bar on Big Twin rigid frames 1936-1957, this is usually done at the mounting holes for the fender braces, which are located on the axle plates. The original mounting bolts are pushed through the axle plate from behind and secured from the front with a fairly large nut (wrench size: 5/8"). The problem is on the one hand, due to lack of space and mounting bolt length, the complete rear wheel as well as the brake base plate must be removed and on the other hand that the nut mounted from the outside leaves a rather bulky impression.
Bates T-nuts can be placed into the axle plate without removing the rear wheel and brake base plate. Additionally they are threaded, so the sissy bar can be mounted with a fairly plain 5/16“-24 screw. This gives the Harley-Davidson Chopper a much cleaner look. Two flats allow you to hold on to the T-nut with a 9/16“ open-end-wrench during installation.