Gie-Tech is the source of the rails Doepfer uses. I don’t know of any US sources. A number of alternatives exist. There’s a fairly comprehensive writeup here:
I bought TipTop rails with M3 threaded inserts for the case I use now. But they’re pricey: $40 for an 84HP pair from Perfect Circuit (includes inserts). My next case probably will have Vector rails. You can buy a package of four 60 inch rails (that’s 600HP!) for under $75 (not including inserts or nuts).
One minor caveat is that they won’t take M3 nuts, you have to use M2.5.
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