UF8
6 RU; part 726490XR available from retailers.
UC1
6 RU; part 726580XR available from retailers. Note UC1 is 11.8" (300mm) wide.
UF1
6 RU; not currently available from SSL. Note UF1 is 11.8" (300mm) wide.
BiG SiX
10 RU; part 729752XR available from retailers.