Is it a straight cab or a slant cab? I think the SLM 4x12 guitar cabs were the ones that went with the Lee Jackson head, but there may have been others I don't know about. Either way, not sure it's going to be the same as the V4 4x12 cab, but could be worth a shot if you already bought it.
Nevermind, I googled it and came up with some pictures. Might work out for you, looks like it's a decent sized cab, just gotta find speakers that will work with the dimensions. Have you checked out JohnK's thread on his v412 cab? I wonder how well the eminence 12's he used would work in this cab.