Hi Frank the tires for these are still available from Yokohama and Pirelli but they are made in small batches, I guess Lamborghini take the ones from Pirelli they where I sourced mine, but Yokohama UK has stocks, not sure about USA, I think this is a good thing the more demand created for these tires hopefully they wont reach the NLA list.
Those crazy DeTomaso owners put the 285/40/15's on the front of their Pantera theres also some requirement from Stratos and I believe BMW M1 owners so it would be good to boost requirements