tis no problem nismoid, there seems to have been many posts with what appears to be the wrong flow rates that keep getting cut and pasted.
i chose the 984 as it has a hose end (which allows you to use the factory sock) and seems to flow somewhere between the 040 and the 044 (but is shorter than the 044 and there is only a bees wang in sneaking the pump under some plastic trim in the tank in an R33).