The DMR MK1 QR Swopout allows you to change your dropout to your desired type on any of these frames; Sidekick, Trailstar or Ex[alt].
MK1 QR (Quick Release) or nutted design for 1st generation frames running 135mm x 10mm hubs with 26" rims.
MK1 DMR frames are identified as having disc mounts with round holes and 1 1/8" head tubes.