Those are not Alps switches:
Someone reported on the DT wiki that they are "XM" (i.e. Xiang Min KSB series), but they might in fact be Hua-Jie AK series: I need a picture showing the mould numbering to have a better idea. There is no photo available of the internals, but someone's 3D sketch of what he thought he saw, matches both KSB-C and AK-CN2 (2), which are identical inside.
Guitar Hero Repair in the UK sell the
YH-B Alps clone as a replacement, but to no avail, I've not succeeded in finding out who makes them, or in fact a single word out of them at all. Miserable toads. (And the stupid things aren't even the right part for some guitars.) The YH-B clone is something horrible like > 100 cN — it's stupidly stiff. I have no idea what spec the Guitar Hero switches are.