I know this is about getting refills for OEM 15" blades, but if anyone is looking for OEM-style 15" blades, NAPA p/n WIP 601537 is supposed to be the ticket. Haven't got 'em myself yet but I intend to check 'em out. Unfortunately my original blades got tossed many years back... I don't even remember why.
http://www.napaonline.com/Catalog/Ca...537_0345972924