I had the rear axle rebuilt by Bill Bellinger at JB Sports Engineering, he fitted the ATB diff when he did the rebuild. I don't know the exact unit he used, but my axles is a Salisbury 7HA, so it's probably the same as the one Quaife list for the Austin Healey would be my guess.
And yes, I'm very satisfied, it's much much better than an open diff at getting drive out of corners.
