Adding Pilots in the rack requires you to install rack rails in the rack and slide rails on the chassis for each Pilot that you plan to add.
Pilot rail kits can be installed in the Sun trademark Rack 900, the Sun Rack 1000, and third-party ANSI/EIA 310-D-1992 or IEC 60927 compliant racks with the following types of holes:
Square (9.5 mm)
Round (M6 or 1/4-20 threaded only)