The spur Nema right-angle NR gearheads 1:1 ratio use the MV mounting kits.
Example, NR34DC-001 can use the MV34-145 mounting kit
The 1:1 NR gearheads are driven with couplings that cannot be replaced in the field.
All other ratios for the NE and NR gearheads use the MM mounting kits.