Toilet T bolts or 1/4 inch carriage bolts—the carriage bolts work better, but if there is no track access point, the T bolts slip into the track easier
1/4" Hex bolts for the top part of the bracket to bolt on the track mount base
1/4" Locking nuts
1.5x1.5x1.5 cabinet L brackets
1/4" wingnuts
Hack saw to shorten any bolts if they are too long
1/4” washers
Stealth rod holders with track mount base

Those look great and will by handy. I would probably put some type of caps or cover on the ends of the bolts or eventually you're going to bang into them with your leg or arm.

Hahaha! The wing nuts have my attention.
Plastidip would be an easy solution.

Another easy option; Amazon sells small 1/4inch screw on knobs.

oh yeah. those would be great. looks like you could cut the bolt a little shorter and the end would be covered too. perfectly safe.

good luck