Yes, you have the chassis area.
I have found them close to the top of the rail in the first section back from the spring hanger. They are usually quite light - not boldly stamped and quite large, at least 1/2 inch.
Hope you didn't clean the paint off with a flapper disc or sanding disc as there is a chance you took the numbers with you - that is how lightly stamped some are. I suppose it depended on whether the "Hulk" or "Rosie the Riveter" was doing the stamping that day!
Lang
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