Hi everybody,
During my research , I found the piston of 1.6l 16s miata have the same bore has 1.5l demio.
And Wosnner sell 11:1 piston for miata 1.6l
http://wossneronline.com/2010_automotive_piston_wossner_catalog.pdf
Page 46
if anybody have access has those both piston , it could be...