i dont see much room on my 90 300se, any ordinary wrench will be impossible to reach the nuts & bolts, i talked to merc dealership, they say there's a special wrench to undo it, anybody knows what it looks like, shape etc. TIA

My 126 300 sd was tight but not impossible to change the clutch assembly.
I did install one from a 560sel, the air volume was unreal, so much air blowing to the point the insulation foam under the hood disintegrate pretty soon. The car eas sold not long ago.

Now my 90 300se I do notice the temp can get hot in crawling situation , luckily the dual electric fan do kick in at 100 ish or else the result will be precipitous.

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