There's 2 versions of the friction material shape.
The pad material can be cuved at the bottom like:
And the 'squared-off' type you have the image off which should be more like 51mm on the pad depth.
Race pads tend to have much less detailed variations and a single type is often used for as many types of cars as possible, so most track/race pads are the version with the rounded bottom side to clear an inner edge on some cars. The 'square' type of pads usually are R90 road pads which are available in very specific types for Elises and the like that can handle this type.