wheel cylinder bolt size ?? on 1991 Dodge Dakota

Does any one out there no what is the correct bolt size ?
trying to remove the old WC with problem finding correct wrench size SAE 3/8 to big 5/16 to small 8 9 10 MM do not seem to fit !

Asked by for the 1991 Dodge Dakota
1 answer
I need to know wrench size for caliper bolts