Where to purchase 34 mm filters for the CV Heliar 40?

these Kood filters have very thick looking.

Who has decided to step from 34-37.......and how has that worked ?....ie problems . the Heliar does have a reasonable vignetting and probably increased with thick filters?

Hap
 
I tested 34 to 39 mm step-up with the Summaron-M 28mm... No vignetting problems, but can't used the lovely supplied lens hood.

(I went 34->39 because I already have 39s for several of my other Leica lenses.)

G
 
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