Larry either forgot to supply the spacers or neglected to tell you, you need to have spacers made. There's nothing wrong with spacers that fit correctly. It's a bit tough with our suspension mounts because they aren't 100% consistent in width or location. If you want them to fit like originals, without spacers, the vendor would need to have custom ends made, which would probably triple the price, or more. Furthermore, they still wouldn't fit every Pantera perfectly, for the same reason the OEM control arms and bushings don't always slip into place.
What you want is not terribly complicated to fabricate but you will have to pay someone to make them for you. It would probably be cheaper and easier to have them made from scratch as opposed to modifying yours.
What kind of shock absorbers do you have? Do they use spacers in the mounts?
This rear suspension was built by Chandler Chassis Concepts. The lower upright pivot is an interesting design. Spacers everywhere though. I count 14 !!! :-)