I just checked the drains on my 1972 350 SL (4.5) as described above. I couldn't find any drains for the channel beams behind the headlights (in front of the wheel wells). Instead I found the channels filled with water.

Were drains added in later versions, and should I drill out drains for this area?

There doesn't seem to be any rust from the water which must have been pooled there, off and on, for the last 34 years.

Thanks,

Paul

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1983 500 SL (Gone )
1972 350 SL 4.5