The next-generation Mazda MX-5 will be the basis of an open-top two-seat sports car that the automaker will build for Fiat's Alfa Romeo under a finalized deal announced by the two companies Jan. 18. The two had announced their intention to work out a deal to this effect earlier in 2012. Alfa will style its variant to be clearly distinct from the MX-5, and each car will be powered by engines unique to the brands. Production of the Alfa variant will begin in 2015 at Mazda's Hiroshima plant. Alfa intends to market the car globally.