Street wheels bearing adapter for 12mm axle MTB trucks

I’ve designed this bearing seat adapter to fit 6901 bearings to 608 bearing seat longboard wheels. Essentially doing away with the issue of tiny ball bearings like the Skate Kastle kit. I’m looking for feedback on the design, and any recommendations on where to get them CNC milled. Initial pricing I found was around $200 USD for 8 plus shipping. If there’s enough interest I’d consider doing a group buy to bring the price down but would need at least six orders,
So far I’ve tested fitted with 3D prints on Duality trucks with single bearing pulleys and Matrix 3 trucks which need bolt on pulleys.


For reference what it looks like on matrix 3 trucks with 107 mm flywheels

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