BB-61,
Those Serial Numbers (A1D315 and A1D325) should be from M247 SGT York's. A1D is the prefix used to ID the M247 system. If you are lucky you might find a stamped Registration Number just to the right of the drivers right side headlamp guard. Should be a six digit alpha numeric number starting with JZ. The M247 hull is unique with additional items welded on. Here is a picture of the front, which shows the power access box left of the hatch and air intake below the heater exhaust.
Hope this helps, would be real interesting if these didn't have these modifications.