Hy Dusty53 your SKF seal number is correct also the same as National p/n 411330N. As far as the re & re, remove the driveshaft hold the pinion yoke with a large pipe wrench braced against the ground or frame or something solid, remove the pinion nut and remove the yoke. You can probably pry the old seal out and replace it with the new one. Inspect the yoke for a groove in the seal surface, if you find a groove you should install a Speedi-Sleeve to give your seal the best chance of sealing and surviving for any length of time. If you do need a sleeve take your yoke into your Friendly Local Auto Parts Store (F.L.A.P.S.) so that they can measure it and order/supply the correct sleeve. When all your pieces are ready for assembly put everything back together and torque the pinion nut to the correct torque, use the pipe wrench again to hold the yoke, Do not count on the tire/axle to hold the yoke, ring and or pinion teeth have been known to break when the yoke is not held by some kind of device, this is especially true if an impact wrench is used, hope that helps.