what type of ford pickup is it? w/ regards to interior lighbars for ford pickups, i'm only aware of a whelen inner edge for the '06-'08 for the F-150.
i honestly think that you'll have a problem with getting a nice snug fit with almost any interior bar for an 04. maybe consider something along the lines of a dual avenger or tomar 200s above the RVM and take the $ that u save from buying a full interior bar to use on lighting elsewhere (i.e. SOS intersector lights under the mirrors, light on the lower dash, grill lights, etc.). just my opinion and $0.02. if you really want an interior bar, though, maybe look at the axixtech SV (it isn't as vehicle specific as some other brands' lightbars and it comes w/ universal brackets but i would be very surprised if u didn't have to make modifications for it to fit snugly)