Thanks for the heads up on that company. Just sent them an email.
On another note, I looked further at the datasheet (2SC4081T107/R PDF Datasheet - ROHM Co., Ltd. - Datasheets360.com
) and found out what the difference is.
ShawnInPaso got it right on. Apparently T106 and T107 are the exact same thing - the only differentiation between the two is how they're oriented on the tape reel (T106 faces one direction, T107 faces the other). Not really applicable for someone buying one or two but a big difference on the assembly line.
Looks like 2SC4081 T106 is the replacement then.
Thanks all for the replies!