Thanks for the wiper lead. I ended up sorting it out by buying a set of ANCO 4102 arms and initially a set of ANCO 2015 blade assemblies. The book called for ANCO 2012 but I figured a 15" set of blades would cover more than the 12's. As it turned out the 2015's are not only longer but the attachment parts are not compatible with the 4102 arms. I ended up getting a set of the 2012 blade assemblies and everything worked.

My other option was to get a set of ANCO 4103 arms to keep the 15" blades. I may end up going tithe 4103's in any even because if I do then replacement blade assemblies will be an off teh shelf item, whereas almost no one carries refills anymore and the odds of finding a blade assembly that fits the 4102 arms off the shelf is minimal.