KTM offer a wide choice of gaskets right down to 0.06mm allowing us to jack the cylinder around to suit applications, TM Racing also offer a good choice of sizes, must be a Euro thing !
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0.06mm are you sure ?
My KTM parts diagram only goes down to 0.2mm.
It seems the reason they offer a few different gasket thickness is to match that particular cylinder the bike has been fitted with. When the cylinders are finished and ready to be fitted they vary slightly in size due to the casting and finishing process. The different gasket ensures that each bike comes out the same performance and tuning criteria.
The same thing goes on with their pistons.