Have not checked that Oaklyss, but I will. I need a list of where all these numbers and marks are so I don’t scrub the marks off ……… I have never had a car that I have cared about the numbers before but this car is different. I tend to stumble across numbers: we are still cleaning etc – this one was hard to miss! Body number 732. So is this big rear diff cover what you are referring to? This in the only really rusty looking part on the car other than thing like the coil springs etc. I thought all the gear ratios were the same!