SPECIALIZED CRR VADO/COMO (GEN.2), REAR RACK, 650B, W/ HARDWARE BLACK. Custom rear rack that integrates with the rear fender body for Gen.2 Vado & Como bikes equipped with 650B wheels [this was taken off a 2018 Specialized Como, with 27.5 x 2.3 tires. It could be that you need the dedicated Specialized rear fender to mount this -- I don't know for sure, but I'm selling the fender separately.
eBay