Adam,
Do a search on "aluminum chain rails", or search on posts by me. There was a HUGE dialogue on MB's past use of aluminum rails, and the aftermarket aluminum rails. (If you are interested.)

Slightly off the timing chain topic originally posted, sorry all.......

fz500SEL - how far from Orlando, Florida? Check traderonline.com. I saw a wrecked 560SL this week, maybe you can buy the engine?

My $.02 worth of butting in here, W126 driver on the W124 car posting....

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1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)