John, I've got a complete used set of 20 from a 1987 300E (W124) with the small dull aluminum color cap on each. If you have specs on what you need ("extended") I can compare, or just the caps. Cost would be $15 plus USPS or UPS either way.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon