04 YZ450 5-spd. Parts compatibility?

I want to add another gear to my YZ. New parts are $840 and some change. I can't find any used WR trans or bottom end anywhere.

I have found a ton of YFZ450 quad trans parts tho. Some as cheap as $75. Anyone here know if quad parts would work?

No, they won't.  Shafts are wider in the quad. 

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