Phil at FastLane should be able to help you with your parts needs and won't give you dealer attitude for owning a nonUS market car.

US market 126s include any sedan with an 'S' from 1981-1991 (300SD/L, 300SE/L, 350SD/L, 380SE/L, 420SEL, 500SEL, 560SEL). The SECs are 126 coupes. The SLs and SLCs are 107s not 126s.

Sixto
91 300SE
87 300SDL
83 300SD