The way I label them...
sxxx-22-yy.dds
sxxx is the stadium file you need to import the textures into...(e.g s009.iff) for hawks
22 is the item number in the stadium file that refers to backboard if u open it with nba2k xmodtool

yy is the DDS number you need to import into...(eg. DDS:4 usually refers to the base backboard)
as for the reason why I don't release the backboard in a single file(sxxx.iff) is because there are many gd quality stadiums patches here...I don't wanna limit people to any particular one of them by releasing the whole sxxx.iff, so Im releasing only the textures so you guys get to choose your own stadiums