300 tdi emergency aux belt

After been caught out with a sized alternator on a days laning I seen on eBay you can get a short aux belt to bypass the power steering pump or the alternator, he is after 20 quid for a belt that may cost 6 quid, does anyone know what the belt is off or any part numbers

I'm aware that the fuel stop solenoid needs a 12v feed or spring removed as I say it's just to carry in a emergancy

Any info would be great cheers