Outer Limits 4x4 Board

Can anyone tell me where the filler bolt is on the back of the 80 transfer case.Drain plug is right at the bottom & there's another bolt (that is rounding off instead of coming undone) a couple of inches up & to the left.Is this the filler plug or is it the other bolt right at the top of the case at the rear?I realy need to buy a manual!!

The one that is rounding off is the filler plug. A" Metrinch" socket which grips the flats rather than the corners of the bolt should get it off.

thanks mate. i thought it was,just wanted to make sure