Torx are almost never used on calipers. I think you will find a 7mm Allen key is needed for that year Mercury. Hard to see as it is covered by a rubber cup.
7mm Allen wrench
The T60 is the size needed to remove caliper bracket.
Most likely 10mm wrench, possibly 12 mm wrench.
18 mm I think.
7mm
3/8 in drive torx wrench.
That is a 3/8 Allen.
3/8"
3/8" Allen wrench
15 mm
from memory the correct size wrench is 9/16 inch box
I believe that will be a 7mm Allen key.