Here is a package off all the official tracks with extra grid spots just the current tracks from the official forum all packaged together.
Imola (added 8 extra pit boxes, total 32)
Nordschleife Endurance (added 10 extra pit boxes, total 34)
Zandvoort (added extra 12 pit boxes, total 30)
Vallelunga (added extra 9 pit boxes, total 31)
Barcelona (GP and MOTO) (added 12 extra pit boxes, total 36)
Silverstone (added extra 8 pit boxes, total 32)
Spa (added 16 extra pit boxes, total 40)
Monza (added 10 extra pit boxes, total 36)
Mugello (added 12 pit boxes, total 36)
Nurburgring GP (added 12 pit boxes, total 36)
Nurburgring Sprint (added 12 pit boxes, total 36)
Brands Hatch (GP and Indy) (added extra 8 pit boxes, total 32)
Magione (added extra 14 pit boxes, total 32)
http://www.mediafire.com/download/82v510bivizu332/OSRW+official+track+pack.rar