Todd,
If you cannot find a set.  You could look to welding the crank BUT hav= e the
crank offset ground to increase the stroke by 2 mm.  That would = increase the
stroke to 78 mm.  You could maintain the stock rods.  Y= ou would need to have
some of the top of the piston shaved about 1 mm to= restore deck height.
The results would be to increase the displacement AND increase the
c= ompression ratio slightly.  If you combine some other basic performance improvements you could add some power.

The 2.1L European WBX engine increases the compression from 9:1 to 10:1 = and
the HP increases by 22 Vs the 2.1L American WBX.  

Robert