wr400 swing arm spindle diameter

hello folks, i recently ceased my supermoto 400, a 2001 wr, and have picked up a temp replacement engine whilst i have a rebuild,

on fitting the engine i find that the swing arm spindle will not fit through the collets/bushes in rear of replacement engine!

also the bushes out of the existing motor will not fit into rear of this engine

are there any retro fit bushes to solve this problem available? or will the only option be to get them turned out to fit my spindle


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