Most likely, 9 1/2"
Check the Edson or the Ocean Equipment site. Center distance is standard for pedestal guards, and Catalina used the 9 1/2" on center for the C-30, the C-320, and the 36, so they probably used the same one for the C-34.Ocean Equipment does sell pedestal guards with a 12" center distance, but these seem to be as common.http://www.oceanequipment.com/products/navpod/sail/pedestal_guards/index.htmSteveAlchemist C-30T #4764Alchemist C-320 #909