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@Smallfurry
Axle to crown' is probably a mute point for a track or road fork as they should be pretty standard in length (at least not vary enouth to effect handling). But its basically the length of the fork (ahem, from hub axle to the fork crown).
The fork crown diameter is narrower on external headset forks and wider on integrated headset forks. This is to match the width of the frames headtube. I imagine you need an integrated type. All the examples mentioned so far are of this type.