You need a 7 m Allen key for that year Cougar. -Of course that key is not commonly in Allen sets, so be prepared to buy one on it's own at a good tool store.
I believe it's either a 40 or 45.
Metric Allen wrench.
It will be a 14 or 17 mm wrench.
You need a 15 mm regular wrench.
45t
use an Allen wrench not a socket or open or box wrench.
14 mm
3/8"
14mm
You need a 3/8 Allen Wrench
the caliper bracket bolts use 18 mm wrench on a 03 1/2 ton 4x4
it takes a 7mm Allen wrench to remove calipers on 2003 ford focus.