The best thing you can do is check the engine code. Go into the boot and lift the carpet and the engine code should be on a white sticker. Its also on the engine, on the cam belt cover(?)
The 115, 130, and 150s all had a 6 speed box. These engines were PD engines. You can also tell they are PD engines by the engine cover. You can pop the cover off, but the non-PD engines (90, 110s) you had to remove a few screws to get it off. They also have 5 speed boxes.
The 130s also came with an arm rest as standard. 150s came with walnut
trim like the GTi 1.8T.
There have been confusions in insurance company's mucking up the models. Mine come up as a 150 and I can assure you its not.