I have for sale one pair of Flyin Miata frame rail braces. They have never been installed and are essentially brand new. I'm asking $125. Please bear in mind that this does NOT include the butterfly brace, though once you have the rail braces installed, you can easily upgrade to the butterfly brace.
Not my pic, but this is what they look like:
https://flyinmiata.com/Store/images/13-69010.jpg