Believe it or not, I still have some of the T&B LT7 drive straps around here. I haven't used them I ages, but I do prefer them to the other styles of drive straps because they go in easy and have rings on the nail shank to help prevent them from backing out of the wood over time from expansion and contraction.
These guys in the link apparently sell them. I believe Barnett also used to carry them and I think that is where I bought them years ago. LT Drive Straps
From their catalog, it looks like T&B still makes the really old style LS saw tooth type drive straps as well. I think those are the ones I used to see a lot on tear outs in older buildings. T&B Catalog Page