You can get both the ATE and Girling calipers to fit, but the ones to go for are the Girling as the ATE only has the smae sized pads as the Escort M16 calipers... The additional pad area of the Girlings is where the main benefit comes from... Evidently early Volvos had the ATE, but the later ones had the Girling, and there were mixtures of both on the front and rear for a few years... Both are available in vented and solid disc style, but the Girlings are most common in the vented style which is what we need [:x)]
PS - I found out the hard way and have a set of the ATE's already modified for an Escort that have never been on an Escort somewhere in the garage... My brake guy told me the differences and I went back and got the right ones....