I don't have a Fleetwood, but IMO you should be able to take the old bulb out and read the #'s off of it. Or take it to a auto parts store and have them ID it.
I would expect them to be a common Halogen H-1 lamp, but till you pull it out you won't know.
PLUS, on my RV it looks like the Fog Lights are actually driving lights, so I assume they were not factory installed. IMO unless you are holding it in your hand, you can't be sure what you need?
1984-2014, 1984 21' Hi-Lo Fun Chaser, 1972 C-20
2001-2013, 1995 34' Airstream Excella, 2001 F250
2013- Now, 2006 Itasca Meridian 36G, Jeep GC