This set contains three multi-part plastic Bloodcrushers of Khorne. This 89-piece set includes an assortment of spiky bits, chains and icons to allow you to customise your Bloodcrushers. Also included are all of the components needed to assemble a standard bearer, musician and champion. The set also contains three 60mm round bases and three 50 x 75mm square bases, enabling you to assemble your Bloodcrushers for use in either Warhammer or Warhammer 40,000.
So the website says they come with 50x75 bases, but the pictures still show them on the older 50's.
-Matt