That seal keeps crap from the outside getting in, so long as it hasn't shrunk (and I can't see why it would have) don't replace it. On the other hand, if you plan on keeping that tranny for another 8 years or 150,000 miles I'd get new ones.
Just make sure there aren't any rough spots or rusty spots on your axles when you pop them in there. Use 600grit sandpaper to remove any of those spots if they exist. Then put some light oil on the shaft that will contact that seal, unless you go with new seals, then leave the shaft dry so the seal has a chance to break-in properly.
"You have to know the truth, and seek the truth, and the truth will set you free."