Should still be no problem. The SM-SH 55 give various options of clipping out from the pedals (left, right, up, whatever). Have you got the PD-M 324 pedals by any chance?

I have an old set of 323s (the predecessor to the 324s) and they came with the SM-SH 55 cleats I believe. I used them on all sorts of SPD pedals so you should not have any problems.