Always knew there were different diameters, didn't realize the 350 ones had different thicknesses! (not talking about external vs internal balancing here) Anyone else ever run into this? Motor I took out had an approx 1.5" thick balancer, replacement is a 2" thick one. Probably going to return the balancer (wreaks havoc with the pulley's and belts), but does anyone know of a source for 8" diameter, less than 2" thick balancers??