1991 Euro 560SEL continues to be a joy to own.

Question: Right next to the fusebox, there's a small ancillary holder that takes two additional fuses. (I can't find this holder referenced in the service manual.) Anyone able to help me by identifying the circuits these two auxilliary fuses protect? [Photo attached]

Note that one of the two receptacles is empty. What (if anything) is on that circuit? And, if needed, what's the correctly rated fuse to insert?

Thanks for any advice here...

Attached Thumbnails

 

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Eric

1991 560SEL-Euro (214,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)