There's an inexpensive set of 15 inch Centras on Ebay, can probably get them for 50 or 75 bucks, though they may need some restoration. I just bought some Pentas or I think I'd take a chance on these for my 123.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=022&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=350099847671&rd=1

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1994 E500 199/Gray 82k
84 300D (Salty) Orient Red/Palomino 141k
88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes.
88 300CE Brabus 3.6 199 on Black 44k