Bearings needed for the old AMT Mercury are the 10X22X6 cageless hybride bearings being sold by the GRW distibutor, costs each 57,43 euro without VAT and posting.
The real old bearing contained a bearing brass inside ring but the new one's are without this bearing brass ring inside.
GRW no is D6900/603217.
http://www.grw.de/en/products/ball-b...-building.html