I've never heard of such a MK84 version too; furhtermore bukerbusters like
BLU-109 have a "simple" hardened steel alloy case and achieve hard target
penetration without DU.
So I don't see the need for a DU modified MK84 for that strike.

--
Matteo
"Try to look unimportant; the enemy may be low on ammo and not want to
waste a bullet on you"