I can tell you this. I had a 1955-66 Shortbed Stepside bed for sale a couple of summers ago and Richard bought it from me. He told me he sold parts and if I need parts for any of my classic vehicles I check with him first. If you are still unsure you can look at this link on his website. http://www.ricos-rods-and-relics.com/References.htm
Richard is a Classic truck enthuiust as well.

JR of HEAVY METAL PULLING TEAM