What many of us would do, is simply run an M14x1.25 tap into the stripped hole, and open up the hole in the starter housing to M14 so it would just barely accept the outside diameter of an M14 bolt, then fit an M14x1.25 bolt of the required length. Not much cost involved, and if you don't already have an M14x1.25 tap, it's time you did. Just be careful opening up the hole in the starter: when opening up holes in aluminium just slightly in that way, the drill bit is prone to grabbing, which can spoil the job, your fingers, or both. Bolt the starter down when you drill it.
