The first (at the windshield) post between lower body and roof is the "A" pillar. The next one back between the two doors is the "B" pillar, and the next(last) one is the "C" pillar. Front to back it goes A,B,C.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold