AB Spring Service, Inc 4537 Roger B. Chaffee S.E. Grand Rapids, MI 49548 ph. 616-534-3399 They made me two standard duty '63 Avanti rear leaf springs. They had a book that gave them those specs, and their number that appears on my receipt is SP 87-547, and they were $85 each. They did the installation for me with these additional parts: 2 ea C716400 Bolts USS 2 ea C716500 Bolts USS 4 ea LC716 Lock nuts USS 14 LH SUW716 (doesn't say what these are, but probably washers) 4 ea LH 71616 Threaded rod/U-bolt 8 LH DN716 Deep nuts In 1992 the total of parts was $186.86 and labor for installation was $87.50. AB Spring at the time also had the specs for the Heavy Duty Spring. Stan Gundry Author/Publisher What The Shop Manual Won't Tell You: Studebaker Avanti Restoration and Maintenance www.AvantiPublishing.com sgundry@aol.com