I got the Powertrack cylinders, expensive but fitted perfectly. I think Bedford CF rears are similar but have a grooved outer face where the brake shoes fit so may need the pistons swapping. I've never done this so you will need to do some homework to be sure. Unless you can find some that will fit for sure the Powertrack ones are your best bet, make sure you fit them in pairs side for side as they only supply the smaller bore cylinders.