Which tire got the nails? I have a stock 18" Bridgestone RFT from the right rear wheel with 5 or 6/32" of tread left that is just sitting in my garage. I was in the same situation as you a while back and got nails in my rear left tire. Luckily, I was getting a new set of wheels and tires anyway, and then putting winters on the stock wheels. So I sold the front two tires, but still have the good rear tire left. If that happens to be the one you need to make a complete set of RFTs (whether to use or to sell) let me know. I'll let you have it for a good price.
'08 e92 335i, 6MT, BSM, 19" iForged Estoril II's, Cobb AP Stage 1+, Mr.5 Intake, Helix FMIC, M3 rep side skirts, M-Tech rep front bumper.