Slacker, you're going to have to learn that this forum is a little different than others, and you're going to have to grow up.
The answer to your question would be found by doing the most minimal of google searches:
miata low headlights
miata hid lights
miata headlight conversion
miata dual headlights
These searches would all get you the kit you wanted in the first 2 or 3 links.
Also, at the bottom of the main forum page there is a list of Official Vendors. When you're interested in buying something, taking a look through their websites WOULD BE A GOOD ******* PLACE TO START! I know that Goodwin sells them.
I'll re-emphasize the importance of the search function:
There are 5 threads in this simple title search for the word headlight
that would have told you what you needed.
If you think we're being hard on you, just remember how full-of-**** this forum would get if people constantly asked the same retarded questions over and over and over and over and over and over and over again and nobody ever told them how to find the answers on their own... then we'd have ten times as many bullshit retarded threads to sift through every time we wanted to find the answer to something. Everybody has to start somewhere... your education begins with learning how Google and the Search button work.