Sorry for the delayed response - I needed to check inventory to see if I had something that would work.
I have Bladetech Holsters for Stock IIs and Stock IIIs, & Lim Customs - but none for a plain Stock. The rounded trigger guard is too different from the others (which are square) to make them work.
Since we haven't sold plain stocks in quite a few years - we don't order holsters in specifically for them. I'd have to special order the Holster from bladetech for a plain stock and to be honest; you'd likely get it faster if you ordered it directly from them.