About two years I purchased new headlights and turn signal lenses for the front of my 1988 240DL. Nothing freshens up the look of these cars like new lenses.

Now two years later, the headlight lenses still look crystal clear, but the turn signal lenses have yellowed badly and look pretty terrible again. The odd thing is that both headlights and turn signal lenses appear to be made by the same manufacturer. You'd think they'd be made from the same type of plastic, but I guess not. The logo imprinted on the lenses looks like an oval with a vertical line through the middle. Is that Scantech?

Anyway... I want to buy new turn signal lenses. I see some on ebay for about $15.00 a side. Am I going to be buying these every two years? Or does anyone have a better recommendation of where to buy from?
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Greg P. 1988 240 DL 'Olga' 170,000 miles