I had problems with NAPA seals myself last year, I put new seals in my axles and when I pumped the grease in it came out the back, took it down the road and it leaked a lot of grease out! Had to take them back out, went to NAPA, they didn't know what was wrong, then I came back home found the old ones, they were made
different inside, went back to NAPA and showed them what I found, they didn't have the right ones, had to go to a trailer place to get the right one.
If you look in side the original seals they had a spring inside the rubber around where it runs on the axle, the ones NAPA sells doesn't have that spring and want seal off on the axle.