I have used this vendor, and they have been great. I have used him on BB pace cars & coupes. I switched because eaton sent me incorrect springs three times for the same car. I can tell you it gets old changing springs. Since they couldn't provide the correct ones, I found this supplier and they have been perfect on the 5 cars I used them on. I am only speaking from my personal experience.
SUSPENSION coil springs, 1934-2007, standard, custom made. Coil Spring Specialties LLC, PO Box G, 632 W Bertrand, St Mary's, KS 66536, 785-437-2025 or coilsprings.com