I have a VIN from an out of state registration...but there is no VIN plate on the truck . I am looking for a plate would have come with the truck when built
ronsway - Bottom line that overrides every consideration for you and your truck at this stage, before trying to find and install a reproduction plate, is go visit your local California DMV. They are the only ones that can give you what California considers acceptable actions on how to get your trucks current "out of state registration" and truck with 'no VIN plate" resolved to the point California will issue you a new title/registration.
I don't know the ins and outs of CA DMV laws/regulations, but my experience in many other states with trying to transfer an out of state title and establish ownership/registration in a new state of a vehicle that has no existing identification plates has always involved an inspection of the vehicle and the existing documentation by LEOs. That's only after I've gotten directions from the DMV on if state laws even allow such a process.
You can easily find the basic legal guidelines and information on California DMV laws and regulation by simple web searches.
Lastly, Stovebolt does not condone or support any actions that circumvent or ignore the law.