I don't think you'll get Lazer-size spur gears to fit under the gear cover (if you're using one)
From memory the collar/bushing needs to 4mm ID and 3/8 OD to fit kimbrough style gears.
The collar in the Lazer ZXR and Triumph was 4 x 8mm
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Schumacher Cougar SV-Durango Dex410-Top Photon
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