Not likely to be 7 and 9mm Allen keys - they're rare to say the least.
Try getting hold of an imperial set - shouldn't cost much. Maybe 1/4 or 9/32 for the smaller one, something like 11/32 for the bigger one.
( I'm SE if you want to borrow, but to be honest, for the cost it's worth having your own if you're keeping this stem.)
@jsabine started
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Not likely to be 7 and 9mm Allen keys - they're rare to say the least.
Try getting hold of an imperial set - shouldn't cost much. Maybe 1/4 or 9/32 for the smaller one, something like 11/32 for the bigger one.
( I'm SE if you want to borrow, but to be honest, for the cost it's worth having your own if you're keeping this stem.)