I've only ever personally seen a WB tonner with 308. It was a later one with L31 M40 GV4 ID plates, and T in the VIN. It was a yellow bench seat column shift car.

Dr Terry told me that his HZ BO6 L31 M41 got stolen during WB production and he tried to order a WB tonner with L31 but he could find no way to get one. He got his HZ back after a time, but a genuine WB ute in L31 turned up where he was working. HDT also did 2 x Magnum utes (1 x genuine, one done for a customer). I'm not sure if the genuine HDT one was a factory order or if it was an L36 M20 with HDT 308 put in.