Barco and their local authorized service partners have ceased production and service for all GP3-based projectors and spare parts in Sep 2024. Color wheels are manufactured for their specific use case and as such can't be bought as generic parts, so your only chance would be to find new old stock sold on ebay etc. or to find a used projector to harvest them. If you're especially fancy and have sufficiently deep pockets, you could apply for a quote from a color wheel manufacturer but good luck convincing them to produce a one-off wheel.