Wix filters have been black for a while now.
when i don't know a specific Wix part number, i just ask them to cross refernce it to a Delco filter that i know the part number for. for my Regal and Cavalier, i ask for the cross reference for a PF52- or just tell them i need a filter for a 90's Corvette if the counter jockey insists on plugging make/model/interior color into the computer.