Hi Ken
The on my HUP the filter mounts to the two on either side of the rear most intake. See photo on my Web page
http://canadianmilitarypattern.com/H...20Page%209.htm
Will post directly on MLU soon.
There is also a service bulletin on their fitting on earlier trucks. My bracket had a torch cut notch in it that I've never figured out.
The two head bolts that it sits on are threaded at both ends, will try and find a picture.
Cheers Phil