where is a good place to buy new pots?

and what type are the best.......cost not being a factor.

100K, 0.5W, 320°/285°, lineal carbon potentiometer is a good choice. (for gameport)
Try here http://www.potentiometers.com/

You will use it in a custom pedals?

no, its for a wheel.

my old red momo was knackered, so i stripped it and used the good parts to make a custom wheel. im still using the pedals as they work fine,

many thanks for the link.