Laser Alignment line/beam Tool with 2 spirit levels + Camber WHEEL Bar DIY HOME | eBay
Taking another shot at do-it-yourself alignment - Hagerty Media
Easy-ish DIY Alignments - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)