I didn't go by the compatibility listings, in his auction he says:
Mercedes Benz W126 Chassis 4 Door Models only 1981-1991 (Models includes: 300E, 300SEL, 380SE, 420SEL, 500SEL, 560SEL, 300SD, 300SDL, 350SD, 350SDL All Models)
I know now that the 300E is a w124, but when I bought these I just took him at his word that they would fit my car.
He's gotten back to me, wants me to pay return postage AND pay him about $30 to reship, says I bought incorrect part. I admit some fault, but his auction ad is wrong! I'll pay return shipping, but I think he should pay to have the correct lights shipped to me.
I'll keep you posted.