you don't really need that. there shouldn't be that much oil in there, and if there is, it's overfull. just on the off chance that it is, put something under there to catch any overflow so you don't get your floor dirty.
now, for some random thoughts in no particular order:
is it hd or aftermarket? if hd, it should have a groove in it for the quad ring. if aftermarket, you'll need to get the pancake gasket.
do you have new screws? why put the crappy zinc screws back in if you have a nice shiny cover? torx or allen, doesn't really matter (some say it does, but i've not had a problem with the torx screws in over 10 years and i've removed my derby a whole bunch of times)
make sure you use a t27 on the torx and not a t25. otherwise you'll be drilling the heads off the screws.
make sure the torx bit is engaged in the screw as far as it will go, and hold it straight while you turn it so you don't strip the heads.
use a small dab of anti-seize on the new screws and don't overtighten them, 8-9 ft/lbs is about right. tighten them in a star pattern, and don't do the final tightening until they have all been tightened some, keeps the stresses even. if you want to use a torque wrench, go for it, but not really necessary. it is not high pressure behind it, so a little snug is good. really tight is bad.
i'm sure someone else will chime in with something i forgot.
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