I just spent 5 years restoring a 58 GMC Napco Panel I bought the replacement steps with the rockers installed. then I installed the lower hinge panel its a lot easier to put the panels in than messing with trying to get a hole front clip to line up unless you have a full body shop at your disposal. Well thats my 2$ worth hope this helps Sam T
PS If I can get the the PICS up of my 58 I will let you look at it.