Recently I made a post here concerning my need for an add on PS/AC damper pulley. I found one... part number ECG 66319-A. Now I need a two belt water pump pulley with the same offset. When the add on pulley is bolted to the damper, the outside to outside measurement is about 2". There is a space of about 1/2" between the two sheaves. I have a friend with a 312 in a 39 coupe street rod. He has such a pulley and thinks it may have come off a 59. Any help here from the panel of experts? Thanks

Wichita,KS