I'm working on a 2006 Eddie Bauer Expedition 4x4 and need help finding the size of the HEX driver that will take off the caliper slider bolt. Everything I've read online says that 9MM is the correct size however a 10MM hex driver will just spin around freely in the hole because it's too small as is the T55 torx. I did try a T60 torx just to size it but the T60 is way too big.

Anybody know what size this thing takes? The rear is 7MM/T45 if it helps.

Thanks!