WalMart has been a real stickler to exactly follow what's on the door jamb sticker for at least the last 20 years. I've got a Miata which came with 185/60R14 tires and back in the day, running high performance Bridgestone RE-71's (developed as an OEM tire for Porsche) in 195/55R14 tires was the 'performance upgrade' for those who occasionally auto-crossed their cars - A really 'sticky' tire. Because Bridgestone made that tire in that size specifically as the OEM tire for one of the little Japanese sport sedans, it was a really popular upgrade for Miata enthusiasts. Same load rating, same overall circumference, but WalMart would not mount them . . . . unless I brought them just the wheels and not the car!
The next years Miata came out with super lightweight 15 inch wheels and 195/50R15's which are the same load rating and the same overall circumference as the 185/60R14's that came on my car. Since performance rubber in ANY 14" size was getting scarcer than hen's teeth, I 'upgraded' to the 15" wheels and the 195/50R15's, again hauling just the wheels and my new tires over to WalMart to get them mounted and balanced
So long as I brought them only the wheels/tires and not the car, they were happy to mount them for me. *IF* there was ever an accident causing death which might in any way be attributed to the improper size or load ratings of the tires, the first company named in the ensuing lawsuit would be the one with the deepest pockets, namely WalMart, so they just won't do it - Probably as a direct result of a lawsuit in the past
For your General Grabber AT2's, th load rating (98) is actually *greater* than the OEM Continentals (97) you took off - The only 'legal' stickler is the speed rating. The Continentals were rated H, which is 130 mph, while the Generals are rated T which is 118 mph
Don