3 small holes in inner mudguard, near brake fluid reservoir

[PIP1947]

Can anyone advise me as to the intended purpose of the three small holes in the right inner guard of my '68 280SL, immediately behind the brake fluid reservoir. I can see no evidence of a previous bracket or attachment, but the holes are clearly visible from within both the engine bay and mudguard. Photos attached. Thanks in advance for any assistance.
Pip1947

[cfm65@me.com]

Hi Pip,
The metal is shaped in a distict little landing or mound and the Lefies have a relay mounted on that little mound. I cant remember which relay, but someone will pipe up with the answer. It could also be the voltage regulator.
Yours being a later model could have an alternator with a built in regulator, hence the omission of a VG.
In the mean time I'll see if I can make out which (relay or VG) it is.
Regards
Chris
Cape Town

[Tyler S]

Indeed it is for a bracket that mounts the voltage regulator and small fusebox for radio (if applicable). LHD

[PIP1947]

Thanks to  Chris and Tyler for enlightening me. The thought did cross my mind but I dismissed it, thinking MB would be unlikely to leave three potential sources of corrosion naked and unfilled. Now I can ignore them. Cheers.
Pip1947