Also helicoil tap kits have a next size up tap in same pitch as original damaged thread, ie check 8m/m helicoil kit, check mine later recalling it had a 9m/m tap, i think.
Know of the 4 size escalating kits i have here in metric normal pitch, the tap was next size up compatible, normal taps are available in 7 and 9 mm, just with the kit you may have a useful kit and tap, not a use once a lifetime tap... HTH j