This is what I did,
select one of the four that you want. Attach that one to the other 3 to form a big square. go into vertex mode and select all the verts. Next to "weld", there is a little box square, click that, then set the threshold to .001. That should combine all the overlapping verts while not messing with any of the other ones. Next step is to reset the pivot point. Then, apply a uvw modifier to the entire thing. Finally, link it to a LOD2 dummy.