We sell our FabBosses in 1.25″ lengths, so they can be easily trimmed to fit. However, it might not immediately obvious how to precisely trim them since they are too short to put in a vise and cut.
The trick is to use a stud and screw them together end to end. Since they are precisely machined, that makes the assembly long enough to grab them securely for cutting, as if you were cutting a straight piece of tube. If you’re worried about vise marks, designate one FabBoss as your “vise-tool” and always use it in the vise.