Those calipers look much the same as the Hope C2's on my LTS, also the caliper is mounted on your forks pretty much in the same position as the caliper on my Z1 Bombers, i'm using a 190mm five bolt front disc and about a 160 on the rear, both discs are mounted using countersunk bolts.
I'm sure chainreactioncycles.com still do new Hope five bolt discs