Early - >6/'86

Early style brakes are identified as having 2 pistons per caliper, the caliper is fixed to the hub and features small, square brake pads that are retained by pins.

Girling style has a large pad retaining spring and pins that are located with small R-Clips.
The ATE has a cross shaped pad retaining spring. *Most common system*

Early ATE System
Early Girling System