Use the Ford Ranger numbers
The 1994–2010 Mazda B-Series was a rebadged Ford Ranger. Regular Cab and Cab Plus (extended cab) trucks used the same 6 ft and 7 ft Styleside beds and the narrower step-side bed as the matching Ranger, so Ranger shells, tonneau covers and bed liners fit.
Mazda has not sold a pickup in the U.S. since 2010. (The current Mazda BT-50, sold overseas, shares its body with the Isuzu D-Max, not the Ranger.)