I am trying to add a second belt for my a/c compressor on my '60 223. I bought a 289 2-sheave water pump pulley that is 5/16" deeper than the stock pulley. My plan was to run a belt from the water pump to the compressor. I know there are shims I can purchase to get the groove spacing right, and I believe there is room between the fan and radiator with the extra 5/16" in there. Thing is, the boss in the center of the pump flange that locates the pulley and fan is short enough that it wouldn't reach the fan after adding shims. Is there a workaround for this? It seems like a bad idea to rely on the bolts to center the fan...