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Whats the model of the Bath John, you have have to reside to replacing the jets with generic parts, but if you can supply me with the model number I can certainly call around and see if I can find a suitable supplier for you.
I have had a look John and cant find any models which have 12 small jets with a diameter of 29mm.
Most likely the bath and parts are obsolete, which leaves you with fitting a larger jet (and the grief which goes with that), or replacing the entire bath.