I see that the US models get the same roof systems as we have! The plastic parts in these sunroofs break a lot.
Adam, the W124 sunroofs are difficult to (dis)assemble...
The sunroofs in the later W202 and W210 are a lot easier to work on; the electrical versions in the W124 and later W201 are terrible; I would not try to repair them myself if I did not know exactly what to do...

greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)