I checked mine on my 2000 HR Endeavor tonight when I got in. Mine has eight lugs with 4 being round and 4 looking like lug nuts.
The 4 that look like lugs have their own nut inside that screws onto the last few threads against the regular lug nuts. I use a regular socket and ratchet to remove those 4 and the WM cover comes right off.
If they were not on too tight you might be able to remove them with the T-Handle wrench. I think if they are not removed very often it just takes a little more leverage.
Hope this helps and disreguard my previous reply.
Michael