Bearing part number

I am installing the 4.1 upgrade and am 3 bearings short, does anyone know what the bearing part number is so I can order from Amazon.
I don’t want to pay more for shipping than parts ordered or I would order from the Maslow shop.

You should have got 30 bearings in 3 tubes.

The on the top of the arm that has the motor mounted to it. The hole that the motor shaft goes through doesn’t get a bearing, only the bottom hole for the motor. All others will get a bearing on the top and bottom.

I made this mistake but caught after assembling one arm.

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Thank you.
I wondered if it was an assembly error. Looks like I will be ordering some bearings as I am not tearing the arms apart again. I managed to break an arm half so I will need to order a new set once there are 4.1 plastic parts available.