86' 250r axle?

[Kfx-xc-racer88]

I'm tearing down my 86' i recently bought and noticed the axle has got spacers on it just before the hubs the ones that you can take the hubs off and take them off to make the width narrower?? maybe aftermarket??
whats the stock axle width?

[petesatc]

the spacers are stock....you could either use them on the inside of the hub for a wider track or outside the hub for a narrower track.....