Originally Posted by tellyho
You can probably get a new plate. In my shoes, it's removable. If not, you could tap it out to the next largest thread and replace the bolt.
I don't think the cleats them sellves would accept a larger diameter bolt even if you could retap the mounting plate.
To the OP: Are you sure the mounting plate is stripped or just the bolt? In my experience the bolts are softer and fail first.