For any of you "youngsters" reading this the round part of the rear bumpers out at the end at the bottom is the exit for the exaust pipes. The taillights (don't remember which side - I think the drivers side) flip up and expose the fuel fill nozzle. My grandmother had a late 50's Caddy and I remember putting fuel in it for her when I was around 7 or so. Don't remember the exact model year though.

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Jim