Roof molding left - SCHWARZ MATT = black matte. Satin black will be a good match.
Realoem.com is just an online parts catalog - can't buy there & the prices are way out of date. Use the BMW part # you find there & shop for the best price. Many dealers have internet sales much cheaper than over the counter at the dealership. Some even sell on eBay.
BMW list price for the molding is $385. These two dealers are in CA - check with them:
https://www.bmwpartspros.com/oem-par...45-51137062137
http://https://bmw.oempartsonline.co...45-51137062137
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2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining