The w140 and R129 wheels are different btw, the offsets are wrong.
I do know of (3) 500E chrome 8 hole wheels if you want. The 500E 16x8 are forged, Im not sure about the R129 ones. The 500E ones have a 124 part number.
I have some R129 SL500/600 silver arrow wheels for sale, with almost new tires. They would look great on an SL. I had them on my 500E, but recently I got some AMG wheels. Email me, Id really sell either set, but I cant keep both.
http://www.500ecstasy.com/forums/showthread.php?t=6489