I'm looking for a GOOD casting or turning to represent the chimney types fitted to these locos as built to GN load gauge, i.e, chimney approx 1' 7" height above smokebox top. It must be a good clean, undistorted item if cast, with a convincing representation of the flare of the chimney and the shape of the typical GN cap. I believe DMR do a Thompson O1 chimney which would be just about spot-on if it is a really good representation, as it ought to be in brass at £4.50 apiece

, but I haven't seen one at first hand.
Can anybody vouch for the quality of the DMR item, or far better suggest a definitely really good CHEAPER alternative please?