1 - We now have some time on our hands to do some things in our storage area which includes identifying  a # of rack rails found in a box. Does anyone have any tips or tricks for identifying what equipment rails might match?

2 - Do you know of any universal rail kits for 1U, 2U and 3U servers, routers, switches that work well?  The brand names are nice but expensive. Thought I'd explore some cheaper options first. We use a lot of MikroTik, HP, Dell and some CISCO with a few other things here and there.

TIA