Spacing of rear wheel on G/S

[Scalpel]

I need to space the rear wheel out on my project G/S. To run wider tyre at back.  What are my options other than relacing the wheel? Its funny season and I need a quick fix. Is there a spacer I can use?

 

[fixit]

 

[Scalpel]

 

[Dustdevil]

 

[Dustdevil]

 

[Scalpel]

 

[Boersoeknbike]

 

[ianb]

 

[Fudmucker]