I believe that RuffStuff do make a armour diff cover for the D44. You might want to check out their website:
http://www.ruffstuffspecialties.com/catalog/D44COV.html
You can get them to tap a drain hole into the cover for an extra $5. I just bought one of their covers for my 8.25 diff and it is very strong and well made.
Not to sure how the D44A and the D44 differ, other than perhaps one is made of aluminium. So perhaps their cover is not suitable but worth checking with them as they custom make stuff as well. Reasonable price and the shipping was also pretty good.