So, I scoured my few go-to resources (google,
fasttech LOL) ... The general consensus seems to be that they are only sold as the top unit, including the 510, which requires much more than un/rescrewing the cap. I don't really understand why the Vamo V5 doesn't come with one of each anyway. Some tops will match nicely on the tapered, but others hang over the side. Seems they would notice you could get a much wider array of good looking
devices on there if you could choose your top cap.