Spacers On Rear Axle

[paper racer]

The previous owner of the bike I bought took the bike apart and reassembled it. The rear axle was put in the right side instead of the left which is no big deal. I am wondering if the axle spacers might have been put on the wrong side. The spacer on the left side has a small "R" engraved on it. Could that perhaps be the spacer for the right side? Thanks.

 

[Peer Lovell]

You gotta give us some hints here. I'm stumped.
O.K., how about the brand of bike? Maybe even the year?

 

[paper racer]

Sorry, It's a 91 YZ250.