I've only seen a couple of mechs wearing a full set of bolt-ons so almost nobody buys them and as they are right now they are only for a really small amount of people really.
I've got some from solaris (like most people did) and they didn't make sense. Since they are not unique per mech, I suggest just making them fit any mech and not for some reason have the same bolt-on requiring an unlock on each mech. Ofc some unique ones should still be only usable on the mech they are designed for.
Btw, if you are not doing this at least make them visible in the inventory, so I won't need to go through all of my mechs to see for which of them I already own bolt-ons. And I know some people have way more mechs than I do.
Edited by P0607, 25 June 2018 - 10:35 AM.