Hello all, I have a '07 XC90. I'm trying to remove the calipers and it has a weird bolt holding them on. It appears it should be a T55, but my T55 is too big and T50 is too small. I took a pic to get a better look at it and it is definitely different. Can anyone tell me what this is and what I need...

Those Internal Torx bolts hold the 2 halves of the caliper together. Don't touch these bolts when doing the usual brake job...