John,
If your talking about the opening ports. Are they broken or just hazed over? I pulled my hazed over opening ports off and used a headlight restoration kit from Autozone and made them look great in a couple hours. Simple to remove the lens, then followed the instructions that came in the kit. Some supplied paste and several different grits of sand paper on sander adapter that fit my drill and presto clear ports again. I think the kit cost me about $20.