7 1/4 Rearend Axle Shaft Seals?

I don't know the exact part numbers for the seals but I had to get them for my wifes 72 dart last month and those seals are outragous at napa they were around 20 bucks each I think i ended up finding them for 16 bucks each but still that was crazy. The later 7.25 with the big bolt pattern uses a different seal (it happens to be the same as the 8.25) and its only 5 bucks each. Sorry just ranting but I figured i'd let you know about the prices. Good Luck Justin