I've gotten products from poly performance, ballistic fab, and rusty's off road. Out of the 3 poly performance was the best.
Poly performance
Everything showed up when they said and in good shape.
Ballistic fab
They were the cheapest but I knew why. I bought a spring perch kit for my dana 70 on my rock crawler. 5/8" U-bolts, top plate, & perches. I had to enlarge the holes on the top plate being they weren't 5/8" like needed for the supplied U-bolts. The spring back hole for the bolt wasn't large enough so that had to be enlarged as well. Finally, the arc cut in the spring perches was to small so I had to redo them to fix my dana 70.
Rusty's off road
I installed a 3 1/4" advance lift kit on a 2014 Jeep JK a month or so ago with some problems.
The quality of the parts was pretty good but they shipped everything in 7 different packages that arrived at different times spanning a weeks plus time. They also didn't ship the steering shock, front shock adapters, sent the wrong rear shocks, and their directions were so bad it was a good thing I've done a number of lifts before!!!
The owner of the jeep was on a time crunch and needed it back together so we had them next day the right shocks, front shock adaptors, and steering shock. What killed me was they made the customer pay for the next day shipping even though THEY'RE the ones that didn't send the right parts. The customer tried and tried but they weren't going to pay for next day shipping.
Sorry for the long post Tom, I just wanted to give my experience with some company that sell similar projects your'e looking for.
Another option is TMR customs or Kore Customs(
http://4x4partsoklahoma.com), I used them years ago and they were good.
If you or anybody else on the forum are interested, I would be more than happy to make any shock or coil tabs/parts you need. I have all the tools needed to make tabs, shock brackets, cups, braces, etc. What ever you need I can help you out. And if something isn't right let me know and I'll fix it.
Sorry for the sales pitch Tom, I just really enjoy making suspension parts & braces. Brings back memories of the my rock crawler build and all the other vehicles I've worked on.
Yellowchevy