This engine/transmission adapter plate allows you to bolt all popular K series engines to any 1990-2005 Miata transmission (5 and 6-speed).  

Unlike other adapter plates, ours are machined out of precision-ground 0.500” steel plate. By using steel instead of aluminum, our adapters are as thin as possible without compromising rigidity or thread strength. 

Our plate design ensures that no additional flywheel mass is needed due to an overly thick plate, and the steel threads can withstand a lifetime of engine and transmission service. 

All plates are machined in-house and individually test fitted and deburred before being zinc plated. All of the required high-grade hardware is included, as well two custom machined transmission side dowel pins.