WTB: Garmin GPSMAP 5##s, want to upgrade from 421s but not change wiring.

[Olde School]

In Port Alberni, can pick up in Nanaimo.
My research indicates that any one of these models will do:
520s, 521s, 525s, 526s, 530s, 531s, 535s, 536s, 540s, 541s, 545s, 546s.