I don't know the size or part number but I understand the manual saying to replace them as a liability issue more then a mechanical one.
In a perfect world you would think a new one would come with the wheel bearing if it was really all that important.
I can't tell you it is ok to use the old one again, only that I do, I will inspect it to see if the threads have stretched but I remember back when I was doing my apprenticeship as a machinist, the books says 50 % internal threads of a nut will strip a 70% thread on a bolt of similar material. With that logic it seems the manual would require the replacement of the axle not the nut. I am sure the material that the axle and nut are made of would be different.
I would go ahead and use it torque it to spec and worry about getting a new one later. Thats just my opinion!
2001 Edge Chrome Yellow ORP 3" body lift 4.0L 5 speed auto
Kenwood DDX6019 with NAV and Bluetooth
Two Kenwood KAC-7203 powering Four Polk Audio Momo MM571 5" X 7"
Kenwood KAC-8103D driving two Polk Audio Momo 10" MM1040 DVC
200 amp alternator and a Boss Audio 3.5 farad cap to keep things bumping.
1994 Mazda MX5 (Miata) Turbo 274 hp 232 ft lbs torque
2005 Honda R12X Aquatrax stock
2007 Honda TRX450R lots of mods