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Replacing a Crank Seal

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It looks like I'm going to need to replace the crank seal on my 05 125sx because it's burning gear oil.  What is the part I need on this page?  70 or 71?  I'm not sure which side is which.  http://www.motosport.com/dirtbike/oem-parts/KTM/2005/125SX/CRANKSHAFT%2C-PISTON?fam=Engine

Any tips on replacing it?  I was looking at another thread, but it wasn't very specific.

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Be easy putting in the seal, there is no stop and it will end up pushed in against the crank bearing. Don't ask me how I know :banghead:

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You sure it's not that the crank bearing is giving out and loose, which in turn causes the seal to leak? Don't want to jump to conclusions but on a bike that old if it's the original crank it may need a rebuild. 

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