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@gbj_tester
No, so cheap that you pretty much might as well do it anyway. Look at the size marked on the seal, I think they are 6001, which you can get for about £10/pr for SKF bearings from http://simplybearings.co.uk/shop/p6183/SKF+60012RSH+Sealed+Deep+Groove+Ball+Bearing+12x28x8mm/product_info.html, obviously get two pairs and share the postage between the two hubs that you're doing the transplant operations on.