If you are stuck for an alternator belt and your local motor factors insists on knowing the vehicle make and model before they will look for parts, it looks like the power steering belt from some Hyundai cars will fit (4PK611 is the original BMW fitment this one is 1mm shorter)
Drive Poly Rib Belt 4PK610
Hyundai Accent 10/94-12/06
Hyundai Accent 1.3 10/94-12/06
Hyundai Accent 1.5 10/94-03/03
Hyundai Getz 10/02-03/04
Hyundai Getz 1.3 10/02-03/04
Drive Poly Rib Belt 4PK610
Hyundai Accent 10/94-12/06
Hyundai Accent 1.3 10/94-12/06
Hyundai Accent 1.5 10/94-03/03
Hyundai Getz 10/02-03/04
Hyundai Getz 1.3 10/02-03/04