Can't vouch for their reliability, and they likely won't come very cheap, but take a look at Holugt or Motor Jikov products.
I wouldn't go cheap on compressor and tanks for CNG - or any other pressurized, flammable gas for that matter.
They give 2900 to 3600 psi though - 200 to 250 bar - so the tanks must be able to hold that much pressure.
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Strayed to the Dark Diesel Side
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