FM 1.6->1.8 Throttle Body Adaptor
 

I bought FM's 1.8 swap kit when I swapped motors but I ended up running the 1.8 throttle body so I didn't need the throttle body adaptor. This is FM's picture, I can get one when I get home if you'd like but it looks exactly the same. It's brand new, never been used. $30 shipped.

http://www.flyinmiata.com/Store/images/05-40000.jpg

Flyin' Miata : Engine conversions : 1.8 conversion : FM throttle body adaptor