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Edavies94
@oheyitsd
Yes diameter of the steerer, most probably either 1 inch or 1 1/8, steerer length ofc and whether it's a threaded or a threadless steerer. You mostly want to match the axle to crown length of the old fork, you could probably adjust it 5mm either way without it having any noticeable affect on the steering.
You could just take the old fork to a bike shop to drill it for you, or do it yourself but you'll need a powerful drill and some good quality bits to get through a fork crown.