[rdmaster92]

I believe the '91 is the same as the '92 RMW (Roadmaster Wagon). My RMW had the rear glass release in the same cluster as the rear wash/wipe switch, in the center of the dash. There was a blank filler plate on the lower left portion of the dash in my RMW, I think in the location to which you refer. The sedans, however, have the trunk release in the location in the lower left dash. If I recall, I believe the sedan trunk release switch vaguely resembles a rocker switch, but it slides, then a spring returns the switch to the previous position. If it is indeed a rocker switch, maybe Buick had another option that they used the location for?