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Unused NATIONAL on left / Previously installed SKF on right I ordered a sleeve for the rear crankshaft seal. I first ordered the SKF brand sleeve from Rock Auto. I was shocked to see how narrow it was. I tried to line it up on the crank so it covers the inner spring seal side and the outer wiper side. maybe it only needed to be on the spring seal side - i don't know. I got it centered with the seal and it had maybe 1/16" or less hanging out of each side. Making matters worse, when the flange is torn away it leaves the edge wavy. so, i took a small hammer and tapped around the edge to get it flat. I was not happy with this and was left having a mental battle within my head about leaving it alone or not. I eventually came to the conclusion that I am better off fixing it right while the engine is on the stand, than in the car. On the second try I ordered the National brand sleeve from Rock Auto. Take a look at the picture, you can see how much wider the national is than the SKF (although note that the national sleeve shown still has the flange attached). The flange on the National sleeve tore away much cleaner then the SKF brand, but not perfect. I just, very gently, tapped it down anywhere it was raised up. but, it probably wasn't necessary, since the sleeve is so wide, the torn edge is far away from the seal. My 2 cents: if you need a crankshaft sleeve, buy the National brand.