Poulan xxv micro chain saw model 205. 1 7/16” bore size

I found a supply of new piston rings at 36.5 x  1.5, 2.0, 2.5 mm so which thickness do I need please 
 

Piston Ring 36.5 x 1.5 mm (1.437 x 0.059 in) for Chainsaws,

Compression Piston Ring 36.5 x 2 mm (1.437 x 0.079 in)

Compression Piston Ring 36.5 x 2.5 mm (1.437 x 0.098 in)

 
 

from DLA Engine Parts after I measured the piston ring at 1/16” = 36.5 x 1.59 mm.  $A6 + $A8 for shipping Greece > Australia