Should be a 15" wheel. My 96 was.
Well if it's supercharged, its the 2.3L. If it's the non-supercharged, then its the 2.5L.
The nut size is 32mm
I have a 1999 Mazda Millenia (non Miller). The back speakers are 6X9 and the front are 6X8. If you want to check your specific model, see www.carstereoonline.com The MB Quarts (especially the ones handmade in Germany --- not China) turned my Millie into an auditorium for music. Ebay has great pricing on new MB Quarts My set of 4 cost under $150 delivered.
Wikipedia says Mazda 6 BUT There really is no equivalent. Mazda moved away from the mid size up-scale market altogether. The Millenia was to be the flagship model for a luxury line that Mazda was planning in the 1990's like what Toyota started with the Lexus, and Honda with the Acura. It never happened and Mazda went after after the small/mid sized sporty type market.
185/60r14
12.5mm
The type of battery a 1997 Mazda Millennia uses is the group size 35, 720 CCA. This battery can be purchased at any auto parts store.
5X114.3
Door speaker size. 6 X 9
There are 2 groups, 36R & 58R
16 inches.
The back speakers I know are a 6 x 9.