Still available since the first buyer backed out to not wanting to upgrade his rotors. Below is how this modification works on 85-92 and 93-07:
All years need an adapter. The ones I have will let those calipers fit on the 85-92 forks using 93-07 rotors and the current brake lines. To use the Busa calipers on 93-07 forks you need different adapters which I only make for 320mm rotors plus you need 4 inch longer brake lines. They will not fit easily on 93-07 forks with 298mm rotors