Where EXACTLY is the serial number on the frame?

[Lebowski]

I went to get plates for the Model A today and they wouldn't accept the number on the engine. They said it has to be on the body or the frame. After I got home I drove the left two wheels up on ramps and looked around on the left (driver's side) frame rail and couldn't find any numbers. I've seen some pics of it being on the top of the frame so how is anyone supposed to see it there? Is there anywhere else I can look? Someone suggested in another thread that the body has to be removed from the frame so please don't suggest that because I'll sell it before I do that. Where EXACTLY is the number on the frame? Thanks in advance....