i,ve just put a bosch 984 in my tank,had to make some minor mods to the pick up strainer,but because of the physical size of the bosch, 63mm, standard 50mm dia,it was a tight fit.Not much room but it will go in with a bit of push&shove. HPI magazine #18 gives you an idea how its done with a 044, which is just about the same as a 984.
hope this helps