In addition to the spares kits, there are kits containing maintenance items unique to specific radios. In particular, MRKs include extender boards, extender cables, tuning tools, and other special items required for maintaining the equipment.

PRC-138/MRK AN/PRC-138 Manpack Radio	RF-382/MRK For RF-382 Series Fast-Tune Antenna Coupler	RF-1110D-02/MRK (1001-1017) For RF-1110D-02 HF Power Amplifier
RF-5000/RF-5200/MRK (1001-1030) RF-5000	RF-5000/RF-5200/MRK (1001-1030) RF-5200	RF-5020/5022(R/T)/MRK (1001-0744) RF-5022R/T (E) Transceiver
RF-5034PA/MRK (1001-0753) RF-5034PA-400 400W PA	RF-5045/MRK (1001-0859) RF-5045 Pre/Postselector	RF-5051/RF-5054/MRK (1001-0751) RF-5051C 125W Power Supply
RF-5052PS/MRK (1001-0858) RF-5052PS 12/24 VDC Converter