Well finally got the crank pulley (175mm) off the GZE much to my relief and replaced it with a blue top one, bolted the alternator and mount (blue top again) on to where the supercharger used to sit, power steering mounted on the front (yet more blue top parts!) and looking at it have no way to tension either of the belts.
The alternator can pivot on the bottom mount but the factory blue top adjusting bracket won't bold onto the block anywhere that I can see. Is it a case of having to make a braket up to suit?
The air con has been dispatched with so the other belt (crank and p/steer) needs an additional tensioner I expect... anything that I can rob off a 4A-GE to do this that will bolt on?