Trojan part number 993483
Stainless Steel hydraulic brake caliper.
Suits Rotor 260mm diameter and 15mm thick
Trojan New Zealand describe this as "Australian Caliper suits Top Hat Rotors"
Trojan price list describes this as "CALIPER HYD STAINLESS 260MM X 15MM"
What we know for sure is that the mounting holes at the base of the caliper are NOT threaded, the thread is in the mounting plate.