The 86 Bushings were larger in diameter and wont fit any other 250R a-arms.
400 ex A-arms will bolt on and go, at the identical width of the OEM 250R arms.
You will have to use all the bushings and spacer collars from the 400ex for it to work.
The only down fall to the 400ex arms, is the upper ball joints are not adjustable or replaceable like the factory 250R arms were.
trx 450R arms WILL NOT work.
Here is where my long useless list of stuff nobody cares about should go...
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"Team on the Teat"