Ah yes, he mentioned in another post that he was off to Music Messe in Frankfurt, Germany. He must have already left.

It would be a question of measuring the overall length of the B7 and the Vibramate bracket when joined together, then I'm sure someone here would be able to measure an ES-1 kit to see how far the distance from the tail end of the guitar to the centre of the stop-tail piece is. If it's just too short, then you could think about getting the ES-1GT kit and installing some studs yourself for the Vibramate to screw into.

The ES-1 kits are pretty much Gibson dimensions, but I don't have an ES-1 to measure, and I don't have a real 335 any more either. As Vibramate make two lengths of mounting bracket for the B7, then I suspect Gibson have changed the size slightly over time as well. I know the bodies got thicker and the two horns went from being fairly rounded, to more pointed for a while.