Right hand side you could possibly do by just moving the shaft. I haven't tried it since its easy enough to get the shaft out. Left hand side the shaft definitely has to come out. I reuse the bolts a couple of times - technically they are stretch bolts, but they don't seem to stretch by very much, and 'enough torque to bend a 3' bar' appears to be enough to hold them in.
I don't know about aftermarket seals - I only use the genuine ones, for now. When they run out I may have to look at alternatives.
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