In terms of the bearings themselves, the ones off ebay will be just fine. For an axle, if the keyways are in the correct place then it will fit no problem, but you must double check that first. It is mainly a handling issue as to which axle you get, the ones from Saxon will probably be better but I cannot say for sure. An inboard engine means that the sprocket and chain are on the inside of the right hand side bearing (like a biland) and therefore you need to take the axle out to replace a chain or sprocket unless you split them. AN outboard engine is where the clutch, chain and sprocket is on the outside of the bearing (like a rotax), therefore you just have to take the rear wheel of to change the chain and sprocket. For that reason, when buying an axle you must check that the keyway for the sprocket is in the correct place for an INBOARD engine. Hope this helps
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