I've got a tweaked one on the left I need to replace, but they were on the car when I bought it. I have no idea what brand it is, and I've looked at all the ones offered online. It doesn't look like any of them with that large hex adjuster on the body. Recognize it?

 

Looks more like ERP than any thing else, but you're right-the hex section does seem oddly large. Look at ERP's site to compare.

 

You are correct!- It was indeed ERP, but an older version they don't make anymore. I e-mailed Cary at Eisenlohr Racing Products (they are in Signal Hill/ Long Beach area) and he was very cool. He's going to probably make a replacement for me.