I think it would not have been bought like that, there was no SL500 AMG then that I know of, especially if the rest of the car appears to be standard SL500

The spoilers may be genuine AMG if you're lucky though

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg