The 8" and 10" skywatcher dobs have the same OTA length, so that's not a problem, and the housing on the altitude motor side of the tube seems to connect OK between 10" motor assembly and the bracket on the 8" tube, so hopefully the size/spacings of the bearings are identical between the 8" and 10" models.
You wouldn't be able to pack out the side closest to the altitude motor, but the gap on the side you've highlighted seems like a simple fix. Remove the two small roller bearings, fit a suitably strong piece of packing timber, and refix the roller bearings so they're now supporting the tube. The tube won't be exactly centred on the base as such, but hopefully this would make little to no difference to the pointing accuracy if you get your alignment right.
Last edited by gaseous; 22-04-2019 at 02:52 PM.
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