There are two versions of the RCGF26 engine. The "old" model and the new model. Bigplanes has the new model.
The left engine in the picture below gives the new model. The right engine is the old version.
The differences with respect to the old model are:
The picture below gives the exploded view of the old RCGF26 model. It gives an overview of the different spare parts which can be ordered.The spare parts are however for the new model. At this moment there is no exploded view of the new model.