I just did this on my C4. I got QA1 rod ends and AFCO swedged tubes. I looked into the tie rod adapter but decided to just drill out the taper and use a 3/4 bolt. Anyway here is a source I found
http://www.daymotorsports.com/product/1948/c/S17/
Also try
[email protected] he told me he had one that would work. Don't bother with Zip, my total cost was $100