Actually, you can use the .45 mags for the 10mm. The lips may need to be tweaked slightly, but typically, they will work with no modifications.
I did find a pair of what was described as Wilson 10's a while back, and they are basically the 45 mags, with a slightly different lip profile, mostly in the rear where the case rim sits. The mags will hold a 45, but because the rear is slightly tight, the case rim tends to not sit back completely, so they don't work very reliably with the larger diameter cases, but are perfect for 10mm/40S&W.
Good luck...