Any "one nub" stripper clip will work.
Examples that will fit the bill:
30-06 Five Rounders
Nato 7.62 Five Rounders
Swede 6.6x55 Five Rounders
The nubs are on 5x Round stripper clips for a few reasons - one is for positive identification. As previously stated an 8x57 stripper will have 3x nubs and there are also 2x nub strippers out there also.