Now that the fuse cover is off, you can view the fuses.

There are three kinds of fuses on this W123:

White fuses, 8 amp

Red fuses, 16 amp

Blue fuses, 25 amp

Your car may have others; check before ordering.

Notice the numbering on the fuse box housing. This relates to the key shown in the next step. There are also a few lower case letters, before and after the numbered section.