2002 WR400 Throttle slide plate - Looking for replacement

My friend had the throttle slide plate in his 02 WR400 crack and disintegrate sending bits into his engine and jamming one of his valves open.
I read this is a common problem and there used to be upgraded plates you could buy, the replacement part is $140 from Yamaha Japan and will take around 3 weeks.

Can someone tell me where I might be able to order a stronger throttle slide plate from? The carb has a red hot start knob which I thought meant it was one  with a revised plate.

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