Mouse Vb6 is the same as TRBV19. Human Vb3 is the same as TRBV28. It´s confusing, to say the least.
Here are some links for finding antibodies for different TCR genes!!:
For a bit more of an overview, as suggested to me by Dr. Daniel Pellicci, have a look at “Correspondence between nomenclatures” also at IMGT / http://www.imgt.org/IMGTrepertoire/LocusGenes/#J