One of the places the Safari varies quite a bit is on the inside of the tank. They take advantage of the pockets the frame & such provide to add a little more fuel capacity here and there.. unlike the stock tanks which are smooth on the inside.
The hole you see is for the 990's fuel pump. If you have a 950, the tanks come with a block off plate to fill that hole.
Because of the amount of packaging involved, be sure and go through the box in detail. I actually called Craig and said "Hey I'm missing some stuff!" only to do a second look through all the packaging material and find it indeed was all present and accounted for (ooops