I like my 37 truck so much that best friend and I got a 40 to build for him. one of the thing that is missing is the center headliner bow. The 40 is one of those years that use part from 39, 40, and 41-46. Will a 37 work on the 40 or do I need to get a 39-40 one? There will be more question on this truck for sure. Thanks Norm