I'd be careful with the stanley site -- the blades for their last-gasp plow planes, plastic-handled versions of the #50, may not actually work in the 45. I have one of those up at my camp in VT, and I seem to recall their blades not fitting the 45. The 'bay lists cutter sets all the time, so that may be your best bet, even if it means picking up another 45 along with the cutters!