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Both of those pieces aren't available anymore NOS. A parts car or junkyard run will be your best bet. I actually found my pieces that way. For the door weather seal, it's part #10283235. For the windshield cowl base, that rubber piece is apart of that metal base where the wipers rest. That part # is 10122028. I actually have the door seal but I need it for my STE. Sorry, I think I might have got the last NOS one. I bought it 6 years ago or so. Possibly...a Lumina/Regal/Cutlass sedan might be the same? I don't know for sure though. Also, a local glass shop might have the rubber piece in stock or could order it for the windshield base. I'm going to the junkyard soon and If I find a good one...either one of those parts, I'll grab them for ya.

I believe it has that dip or channel in it so that it locks to the metal base and follows it's curves.