Check with Ben at Bens Workshop in Austin (sorry don't have the # handy) he may have one or know where you can find one. The 15 hole wheels were standard on all W126's from '86-'89 so any model would be good as a junkyard donor - quite often the spare wheels are intact and in good shape.

Good Luck

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown