1995 Pontiac Bonneville problem with headlights

Can't replace the 9005 (high beam) with 9006 (low beam). They look identical, but they don't interchange. You may be able to adjust the high beam down and low enough that they won't blind the oncoming traffic. Beam pattern won't be the same but at least you'll have headlights.

Look around at the wrecking yard. You may find a multi-function switch for reasonable amount to fix the problem.