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@Smallfurry
The stack height is pretty unimportant with regards to frame+fork fit. It becomes important if you like to have your bars as low as possible.
Once you have the headset, you chop the steerer tube to size, or add headset spacers beween the top race and the lockring if you want to keep some length on the steerer. The steerer should not be too long as to prevent tightening of the lockring onto the top race. Neither should it be too short so the lockring has too few threads engaged. The easiest way of doing it is to install everything and measure the gap between the top race and the lock ring (which has a top lip, so stops on the top of the steerer). cut the measured amount off the top of the steerer, add this distance in spacers, or do a combination of both.
If (as it sounds) your steerer has already been chopped. Then you just need to make sure you dont buy a headset with too large a stack height.
