UW. Did you look at the front seal as shown in the JD parts catalog on the JD website? I have never changed one and have very little experience with an LA, but the parts catalog shows what looks to be a regular lip type seal and a slinger or thrower. I can't remember which term they use in the catalog. I never could figure out what a slinger "slung" or what a thrower "throws", but they were common terms on old engines.
Some of the guys can copy the pictures, but the best I can do is send you a link to the LA parts catalog. Copy and paste the following.
http://jdpc.deere.com/jdpc/pdfs/PC0151.PDF The crankshaft and related parts are listed on page 8. If you have problems with the website, write back and I will try to help. Green Magazine is also a great source for parts and information on the old tractors.
The LA is a really neat little tractor. I always wanted one, finally got one and when we closed our dealership, I gave it to a friend of mine who was a collector, thinking that I might be able to have some fun with it, with him. He died suddenly, shortly after. I could have asked his wife to get it back, but I couldn't bring myself to ask.