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@Hovis_Brown
Are you asking about the width of the steerer tube or the length of the fork? do you have a bike that you're already comfortable with to compare the length or is this your first build? did the bike you're working on already have forks that you're replacing?
the length isn't too much of a problem as you will need to measure the length of the headtube and add how much fork you want sticking out of the top. go longer as you can always cut back a steerer but not add to it (that is, of course, dependent on whether you're going unthreaded or threaded). as for the width, you'll either want 1" or 1 1/8", but that will depend on the headset that you've got on the bike.