Oh... well, the Amazon photostream shows both so I would assume both are included. I was under the impression that the pile-drivers were molded in.
Which brings us to where we are today...
Thanks Tober - yeah, I've been trying to work out if the piledrivers can fold back in somehow or if they're too big and are removable like the jackhammers. I think I can live without the Amazon one unless I can get it at the same price. I suspect I'll be buying the mould again in future anyway, for G2 Sideswipe and Tigertrack and maybe Red Alert and Deep Cover.