They were advertised as RX7 460cc red top injectors. The clip is square, as opposed to the rounded Miata ones. The Miata pintle caps are too small.

Part number 195500-1350.

EDIT: Clips look just like these:
http://cgi.ebay.com/ebaymotors/ws/eB...m=190405969714

EDIT2: Ok, after some research here (http://www.witchhunter.com/injectordata1.php4) they are, in fact, from an RX7 and they have hte same clip, but came in both high and low impedence. How do I tell which ones I have?

 

If you have a multimeter measure the resistance between the two pins on the injector where the connector goes.

 

I always thought the square clip was the low Z ones.

 

The low-imp are 470cc.

 

the high impedance ones are notched differently than the low, on the plug, i think ones lower center, and ones offset or something, i forget....

 

Don't take any thing for granted. Check them so you know.

 

+1 it takes 3 seconds to check. hi-z is > 10ohms, low-z is < 4ohms