Man, I keep eyeing those end caps but my only issue is the fact it won't have the same color as my satin silver Provari. Yeah, it's stainless steel and it'll still be silver, but it won't be the same and it'll make my OCD go nuts. I wouldn't mind buying just the end cap, but I'm always using my Provari in 18650 mode so I'd need the extension cap as well which would add even more of an off color to it. I might just buy it anyways though, I really need a stand for my Provari.
Another option would be a Vape Nutt =)