I have a DSS K2 seat (and cover) here. The shape is correct, but one important thing is missing: the famous holes that go up from the bottom, right under the bones of your butt. The OEM seat has around 20 holes, about 1cm diameter and 1/2 the thickness of the foam, going up from the bottom. They looked like they were molded in the original foam, cut in later ones. This relieved the pressure under your 'lobes', and was also found in the K0/1 seat foam (the red ones). I made similar ones into my [current] handmade seat years ago: it is key to the long-distance comfort ride.
Modern seats often have a layer of lower-density foam, either on the top or bottom, in the same areas. I saw some of these 'in the white' for another brand of bike, and they were glued together to make it into one foam piece.
