Tim, I think you do have some of those cards mixed up indeed. To clear things up, here are the numbers/applications.
Card# 7E282 mfg. no. 3693715 is for 50-55 all models, manifold to muffler pipe.
Card# 5T499 mfg. no. 3705359 is for 51-55 1/2 ton 3100, tailpipe.
Card# 5T430 mfg. no. 3696161 is for 50-55 3/4 ton 3604, tailpipe.
