Heinz,
The two main factors I think, are shoulder width and canopy height. The latter may be compensated for by seat height adjustment or as in my case (for the right seat) by adding or taking out seat cushions.
I don't know of any factory-built aircraft that use a similar-sized canopy but as for homebuilts, I believe the Turner T40, Thorp T18 and the Mustang II all were designed for the same canopy as the Sidewinder. You may be able to find one of those in your area and try it on.
Best regards,
Chris