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These two vacuum advance diaphragms were removed from '56 ford 292 y block engines with four barrel "tea pot" holley carburetors. They are also correct for '56 312 y block engines. They may be correct for '56 mercury and thunderbirds with these engines but you will need to research this on you own. I think only one of these may be in working condition as is. The other one will need to be repaired. The one in the third picture holds suction when I pull the rod out and place my thumb over the hole but the other one does not. Maybe this one can be repaired? Anyway this sale includes both pieces. Thank you for your interest.