The unitary mounting wall includes {HEAD ~ mounting holes} extending horizontally in {TAIL ~ the inner side surface} above the mounting holes 
extending horizontally in
The unitary mounting wall includes { HEAD ~ mounting holes } extending horizontally in { TAIL ~ the inner side surface } above the mounting holes
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH