Just a few points on Mafacs….For the centerpulls, other than Raid, there are four different stirrup lengths, short, standard and long…and adjustable. The Raids had their own stirrup, which was of course both wider and deeper. The calipers proper came in three lengths…Competition (short), Racer and 2000 ( the same, long) and Raid (wide and long). Raids are designed to have their pivots spaced 1 cm wider than the other models. The reach advantage of Raids over Racers or 2000s is only 3mm in braze on format. I am purposely ignoring the GT model, which was shorter than all of these, so not really pertinent.