Thought I'd pipe in here as there's so much misinformation on the towbar on M135i particularly with people thinking you can't have a towbar due to space limitation from exhaust
After about 6 months of looking for someone to install one and being told "not available". I've just had a heavy duty Hayman Reese towbar fitted to mine in Sydney Australia without a single problem. 125kg vertical weight and 1200kg towing capacity. Removes/installs in about 30 seconds.
The model from Hayman Reese was simply for the F20 125i.
http://www.haymanreese.com.au/produc...owbars-class-4
Installed by Rallyspeed in Sydney with full electronics.