There isnt a VIN plate on a 41. Its too old for that. If you are looking for the body style, number, trim, etc. plate, I believe it is mounted on the firewall in the engine compartment. If you are looking for the equivelent to the VIN, there is a frame/engine number which is a uniqe identifier for your car. It should be on the top of the frame on the drivers side just behind the engine mount. In the case of my 38, it was covered by about 1/2 inch of congealed oil under the main wire harness where it ran along the frame. That number is also supposed to be matching on the engine, but I havent found that on my car yet.