Looking for a 11 or 12 tooth sprocket for a 350x

[250sxer]

I saw a post on here one day about someone knowing where to find 11, 13,15 tooth sprockets for a 350x.....I have a 14 tooth with 20" tires, I want a 12 tooth when I go to 22" or even a 11 tooth if I go with 25" on the back.
Help me out!!

[BIGCRIP28]

either sidewinder or sprocket specialties will custom make one but it will cost.