In terms of 50mm bearings, there are two types, I don't know the proper names but they are the chunky ones 90mm and less chunky ones 80mm. For axles you can just get the pattern ones which you will find is just as good for most chassis, which again you will find on good old ebay, the only thing you want to watch out for is that it has an axle key in the right place because of course a biland has an inboard engine, whereas rotax's have outboard engines.
If you can tell me what chassis you are on then I may be of a bit more use, but I know that the Corse axles are only about £50 from Saxon, which (I think) is only £10 more than the pattern ones on ebay.
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