the replacement for the Centurion Bridge layer, the Chieftain AVLB (see my other listings) . It was used with BR90 bridging system as well as No8, No.10 scissors bridges and No.12 and the No.11 modular bridging system (again see my other listings).
The conversion allows the model to be depicted as a stand alone or with one of the bridges deploying or transporting. No bridges are included.