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@Halbert
No idea.. :) Those are sold as shimano-compatible cassettes, yet, when we measured the cogs and spacers, it turned out to be 5mm.
A friend of mine was riding his 8spd 1056 shimano gruppo with 8spd sunrace cassette, without problem, then we changed wheels (I have 8spd campag setup) and continued the ride on each other's wheels without any issue.. really. I have no problem with shifting on a 8spd sunrace cassette.
Cheap, available in 12-25 or 12-28, 11-21 ratios, as i recall.
also, keep in mind: even 4.8mm can work fine. because the upper-lower limit screws will determine your dérailleurs two extreme positions. You set up the gearing on the middle cog of the cassette, so, in each direction you'll only get a very little misalignment, which will not be noticed due to the free-play of the derailleurs jockey wheels... most jockey wheels have around 0.5mm wobble, so, if the aligment is correct on the middle two cogs, and the two extreme positions are set up well, the gearing should be fiiiinneee :)