I don't know how useful this is going to be to you, but......
I resently opened up my first laptop, and I had to fine "that" torx size. Turns out is does not seem to be the part of most torx sets, which I found out when I went to purchase it. However, there was an all in one computer screwdriver set which seemed to have all the correct drivers, to include the correct torx. This includes T15,10, 8, 5, 4, and T3. A # 1 and 0 tip screwdriver. The driver is all non-magnetic. I found this computer tool at my local True Value hardware store. I think it the T8 that is difficult to find.
Good luck.