there have been a few threads on here about vehicles that dont have aftermarket lights, they bake it a while so the silicone comes loose and frees the lens from the part that mounts the bulb. then you paint it or what ever and put it back together with silicone adhesive.
the tbi ones use single post carb stuff but yours is after that, like the tbi trucks, caprice, buicks and that. yours is not what they are talking about. what do you want the chrome for dress up? they have spray systems that you can take your stock stuff and make it look chrome, even starting from black plastic. i have used it on my firebird, they have a shiny primer you have to use, and i got some blue chrome for some stuff under the hood.
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock