If they're Alko hubs, with 'sealed' (SFL) bearings, then bearing savers won't do you any good. If you're not sure, pop the dust cap off and if you've got a big, gold nut, with no split pin, it's likely you have SFL bearings, so save your pennines.
If you have normal bearings (when you pop the dust cap you'll see a normal, castellated nut, with a split pin through it) then you'll need to measure the inside diameter of the drum boss (the bit the dust cap fits in to), accurately and then go hunting.
Drop a post up, if you get stuck. All the best.