John: Despite having that slot you mentioned, this armrest *could* be used in Ambassador/Matador/Gremlin/Hornets of various years up through about 1977. It most likely is correct for a 71-73 Matador/Ambassador on both front and rear doors. I believe these models needed the slot for the door release handle. Starting in 74, the Ambo/Matador had a door handle that was recessed into the door, so they would be different from that point. **I'm thinking**, anyway... Jeff Reeves Auburn GA 79 Spirit GT 72 Javelin SST 69 Ambassador DPL Message from Year One, Inc.