Hey Rob,
I forgot to tell you to check under the white paint on the wheels, if it is red that is another good give away the paint has been monkied with. From your serial number the grill should be yellow, wheels red. It is possible that the tractor could have been severly damaged at some time, causing the parts the serial plate is mounted on to be replaced with ones from another tractor, but from what you say and show, I have no doubt it is an 88 diesel RC. As I recall only a few very late supers had white paint. You might want to check some paint codes if in doubt. I agree with oleblu on the frame, it certainly is an 88 frame, a super 88 would have a flat mounting pad on the front, and flat mounting pads on the sides. The good thing is it looks like great project material, and 88&#039;s look real good finished out.