Mazda H platform  The Mazda H platform is an automobile platform for rear-wheel drive full-size cars. It has been used by a number of vehicles from Mazda in Japan and abroad. Note that a number of Mazda vehicles have similar platform codes but are unrelated. The following vehicles use the Suzuki H platform, not the Mazda H platform:  Prior to 1981, Mazda coded this platform as "LA" in the VIN. The HB platform was introduced in 1981 as the Mazda Cosmo coupe and Mazda Luce/929 sedan. The Luce was updated in 1986, with the 929 following the next year for some markets, but the Cosmo continued on the HB platform until 1989. Applications:  A new Mazda Luce/929 sedan appeared in 1986 on the updated HC platform. Again, the export-version 929 lagged for some markets, and the Cosmo continued unchanged on the HB platform. Applications:  The Luce nameplate was retired in favor of Sentia, but the H platform continued with the 1991 HD revision. Applications:  Export of the 929 was halted after the HD platform, and the Efini marque was gone as well, but the Mazda Sentia continued for one more generation. Applications: