PIA job but this is how it goes
Chop up the two nuts on the top so the cover can come off
Remove the blower housing & tap the 2 bolts out of the bottom ( the don't come out easy )
Get 2 new bolts and a new cover
Fill the hole in the blower housing with any hard setting epoxie you like grease the threaded section of the bolts to prevent the epoxie fouling the thread then poke the bolts through.
I have found the plastic petrol tank ribbon / tape works the best
Do 1 at a time 1 day apart .