The Phoenix uses a different slipper from the B4 but its a very common design. Its basically the same as used in all 1/12ths and I think most TC's too.
You don't need the same number of teeth, but a spur with less teeth will increase your gearing (more top speed, less acceleration and duration) and vice versa. It will also effect what sized pinion you can run.
Worst comes to the worst I can lend you one for my RC10T.
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Yz4 - Yz2
DEX210 - Cobra 4210- DEX410
RC10 Team - Manta Ray - RC10T
Mini Trophy - Blizzard - Wheely King
Tz4 - GT24B
BMRCC
Emergency back-up race controller
(but only if nobody better is available)
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