1676 8-function decoder for HO-Scale locomotives equipped with a MTC21-pin connector and Keep-Alive wires and connector – #TCS-EU821-KAC – Litchfield Station
European Hardwire Plug (MALE) 21-HWM-5PACK – #TCS-1653 – Litchfield Station
21MTC Interface
21-Pin to 8-Pin Decoder Adaptor for DCC & DCC Sound Locomotives
Adapter for PluX22-, 21MTC- and SUSI-Interface
ESU 51968 Adapter Board Mtc21 With Wiring Harness and Aux3 Aux4 for sale online | eBay