Extended design of these tanks allows the lines of the tank to flow into the lines of the seat for a great custom look 2" longer than a standard QuickBob tank Tanks have cutout in rear for seat nose (some seats may need to be shortened) 3.9-gallon capacity Utilizes a 22 mm petcock Comes with necessary mounting brackets When installed on '92 and later models and the OEM continuous venting system is eliminated or disconnected, do NOT reuse your stock vented cap. Stock vented cap should be replaced with earlier version of the screw-type caps.. EXT TANK SMTH 2CAP82-03XL