Another tire size thread

I promise I will check the archives, but I might as well as the list, 
since you all (y'all) have nothing better to do.  A friend just gave me 
four Yokohama spec racer tires.  (Well used, but they have a few 
autocrosses left.)  The rears are 205 60R13.  Is there any chance 
they will actually fit a SWA RB Midget 1500?  Which wheels, or 
what size wheels would work?

TIA,

Allen Hefner
SCCA Philly Region Rally Steward
'77 Midget
'92 Mitsubishi Expo LRV Sport