I have the tcp connectors (don't know if they're still available) and the "x cage" or whatever they call the connector, connector.
One of my favorite mods. That along with a shelby style roll bar have taken what was likely a SHAKIER than average classic mustang and made it pretty damn pleasent to drive.
Do as much as you can to lock everything down, it's a real pleasure to drive.
Next week I get my 17" wheels and khumos. Should handle pretty nicely. Can't wait.