These are very hard to find, Norton #66252902216 (old product number K2138324) 7X1/4X1-1/4 53A46F12VBEP Grinding Wheels.
This is an open structure wheel with a Porous Bond. We are selling these wheels for only $15.99 ea. I
Please keep in mind that if your looking for any Norton product, give us a call (1-800-322-0005). We have a huge supply of wheels, abrasive sheets, polishing paper, abrasive rolls, belts, and Norton bear-tex products.