Snowmobile Repair: suzuki snowmobile, confusing question, xr400

Question
i have a 1973 suzuki xr400. youve helped me before with questions so this one is kinda hard but hopefully you can answer it.
ok.. theres a guy that has a parts manual for 1 1974 sm21. i have a 1973 sm21k. now ive seen sm21WL, sm21L, sm21K, and then just plain old sm21. now do you know the differece, do you think that the part numbers will all be the same and i could use it. i mean there all xr400s , im just wondering if the parts would be the same, like i said kinda hard and confusing question, well i hope you can help.
thanks alot
matt

Answer
Hello Matt,

  Yes, it is a bit tricky with the old Suzuki sleds, only because nothing is published for them, for the most part. I think the parts manual would be fine, from what I know there is no difference. There may be small differences, but not any of the main parts. Sorry I can't help you more. Let me know if I can help with anything else. Good luck with the sled! --Arcticatman