Left = 18R-G late and 2T-G, adjustable.
Centre hole 21.0mm, pin holes suit 6mm pin.
(Late model 18R-G and 2T-G cam gears are interchangable)
Right = 18R-G and 18R-G early model
Centre hole 13mm (not used, so size doesn't matter), 8mm bolt (x3) and dowel holes (x1).
These mount with three 8mm bolts (8.3mm holes), locate on a fixed dowel and have a different offset as they mount backwards on a different design of camshaft.
Do the ones that you got resemble any of these?
Can you post a photo and confirm the size of the hole in the middle?
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