TD,
Bud's Benz now sells separate chrome, lens and housing units. As you probably know by now, your unit is a one-piece, and I don't know anyone who has been successful in salvaging the lens as it is so difficult to separate from the chrome without damage. And I believe you have the correct color (amber), just be thankful you don't need the scarcer all red unit that is correct for the older 113's.
Check with Dave at Bud's, he is very knowledgable (but not cheap)!
Best,
g
'64 230sl, fully sorted out...ooops, spoke too soon