Whether you want to match the present colour or choose a new one, all body shops have a huge choice of colour swatches, catalogued by make, model year, primary colour etc. Just take your pick. From the colour chosen they then mix according to the formula for that colour swatch. That's how out in the sticks they can mix matching paint for the world's most exotic and exclusive supercars, or the sole surviving Ford baccy truck or ute.
Simply choose someone local, they should have no problem mixing colour coat your requirements.
Swarfy.