Hi again. The overall dia of the sprocket is about 525mm dia. (20 11/16 ish) (max dia.) The bore is probably 16" (406.5mm ish?)
That sprocket (your pic) looks like a later type Canadian one with integral shoulders to carry the track better. (reduce wear) The LP2 / 2a. later had bolt on supports (I've only seen the drawing in a manual) probably similar to the Loyd carrier ones.
What are you trying to achieve? If I knew that, it would make sense to me and what I write might be more useful to you.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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