Kit, we had an '84 C on '83 E350 and the above was all the chassis fuses it had. Few Fusible Links under the Hood and that was it. Panel above was in the floor pan to the left of where the column passed through the floor mat.
Your '08, probably more than our current '02, has probably 3x the circuits and fuses the older ones did. Especially while they still had carburetors.
OP, First, Belated Welcome to the Forum! You have questions now, but it won't be long before you're giving answers!
You should see either three socket slots in a "C" pattern or two slots in an "L" pattern. If you have a single front turn signal bulb and two rear bulbs (on each side) and do NOT have a trailer or vehicle connected to your coach... Then you need a Three-Lamp version of the "C" or "L" flasher. One bulb each side and then you need a Two-Lamp flasher. Yes, you can get a "Heavy Duty Flasher" that blinks between one and six bulbs. Problem with those is that they flash at the same rate regardless of the number of bulbs. That's good till one goes out. The Two- and Three-Lamp ones blink differently or not at all if a bulb goes out. That warns you to get out and check.
I don't remember if we had a separate flasher for the 4-ways. I don't think so but again don't remember for sure. If Ford's solution in that year was One Flasher, then (at least logically) it'd need to be the HD version.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB