What body style do you have? If you have the original interior you might find it in pencil or chalk on the seat bottoms or on tags on the cushions/springs. On my 34 town car it is even stamped in the the bronze castings that you put in from the top of the b pillar to the top of the windshield for the top to snap to. I think the number is even on the back side of the carpet and the inside of the trunk, also with a Fleetwood number in some places also. My body number is 15, but the Fleetwood number is 5037KX, which may be the special order number from the Fleetwood build sheet. I think that the body number is also stamped in the wood sill in the front too. Dave Mitchell