what size bolts on a 1989 buick lesabre starter?

[Christine R]

I took one bolt off it's a 15mm what's the other it is smaller? Can anyone help me on this one? Thanks

 

[RoadyRider]

If I remember correctly it's a 13mm, but it could be 14.

 

[joemong]

it should be the same ,but different size bolts