There is two mounting patterns for the converters, small and big. Sounds like you went from one size to the other. I am sure you already noted as well that the bolts and mounts only line up one way, that is the converter holes and flex plate only line up in one of 4 positions, eh? Also, there can be different size bolts for the different converters, I believe going from 3/8, 7/16, to 1/2 inch as well. Good luck!