Check out OPR's web site. He uses Moog and McQuay-Norris parts. Both quality "made in the USA" components.
BTW: I *think* Mustang Depot stocks some of the OPR stuff as well. So you might be able to purchase from them.
I have been running some first generation OPR stuff (from before it was OPR) onthe '66, as have a few others on this site. Very nice quality!

Good luck,

 

I always found them excellent to deal with when shipping stuff to me in the Netherlands and the product is top quality as scott says some mustang part house do carry his stuff.

 

Update: I went to Sears and bought a 1 1/4" socket (3/4" drive) to takethe capends off the control arm shaft. I got one side off and it was obvious that the threads in the control arm were finished. I could not get the other cap off even with my longest breaker bar, WD-40, heat and some whacks from a ballpeen hammer. That's too bad since the arm was in great shape--hardly any rust and no signs of damage or wear.

So I need two new upper control arms. I'll try sending Opentracker another email since his products seem to be the best quality for the money.

 

As a friend of John at Opentracker I hope you will give them a second chance. John is a really good guy who's #1 goal, like mine, is to help people. John is a 1 man show. he makes all is product by hand and his quality is top notch. as of late he has been hurt and in spite of that is still working to fill orders, just not as fast as he was. If any one has any questions about opentracker's product feel free to ask me and I will be happy to answer your questions.

 

If hurt, I can understand. I have heard nothing but good comments about his products, howeverI did try fora period of about 4 weeks to contact them, without areply.If he's up and running now, I will try again.

 

What's the difference between the "Street" and "Custom" control arms? Both of the"Custom" arms haveMoog balljoints and the "Heavy Duty Custom"arm also has a Moog shaft. But the custom arm also say this:"Our heavy duty upper control arms start out with a new frame that is the same thickness as the original." The heavy duty arm is also $85 more than the "custom" arm.

Does this mean that the "custom" arm comes with a thinner frame than the "heavy duty" arm since the Moog shaft kit can't be $85 more than a non-Moog shaft.

And what kind of frames are being used for the "Street" arms? Are they thin Chinese junk? The "Street Ready" arm is just $190 and the reinforced street arm is $260. What kind of components come on these arms since it's obvious that everything is cheaper with these arms.

Is the "custom" upper arm a "street" arm with Moog balljoints? I'm not on a tight budget and can afford any of these, but I like to know what I'm buying. His product lineup is really confusing.

If you know the answers please post them.