We all know 9004 bulbs suck. Good thing your bonne'* don't use 'em. So, I found some info about a guy who'* producing projector headlights for the 91-96 caprices. They look pretty schweeeeeet.
So, the guy has a website... http://www.focuztech.com/
Sounds like he could be in the market for producing lights for a variety of vehicles. Maybe he can be pursuaded to produce some for the bonnevilles.
His email address is miket at speakeasy dot net. I already asked him about availability for the caprice and WJ headlights. Someone may wanna ask him about bonnevilles. Last I knew pricing for the Caprice lights was about $500 for the pair, with a new high-current wiring harness.