Sure, they are chromed plastic and look nice. I used them with 3 bar spinners and also used plasti-grip on the hooks to help them stay on with the added outside weight.. I don't presently have any photos, but you can see a set done the same way here on Mr. Wizard's trike. Wiz also put the polished cover plates behind the wheel to stop brake dust and more chrome look.:
P.S. These caps are on the older 1st version . Not the latest version.
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The chrome disks that go behind the wheels can be ordered from RJS Originals, you will have to do a google search. Sorry, can't help with the plasti grip
I also did the domed hubcaps and added spinners. I just added some heavy duty tape to the prongs to tighten the fit. No issues. I know some added a silicon dab to each prong and let it sit overnight after installing.
Some company needs to manufacturer a high quality chrome trim ring that would cover up most of these crappy rims on the back of our TG's. With trim rings and center caps these stock wheels would look a lot better.
I also have them on my 17 trike. No problems, they clean up nice. One thing for sure, Harley chrome is top notch. I've had them off a couple of times so far, and they still fit just fine.