BICKNELL BRB 7 Fan Shroud is an aluminum fan shroud designed to fit all radiators with a shroud mounting width of 19 1/2". The total height is 22", and will accommodate 17" fans. The depth on the shroud by itself is 2" but can be extended to 6" with the optional extension. The optional extension can be cut to length, so any depth from 2" - 6" can be made. The extension simply clips into place on the shroud with tabs that are bent over, thus securing it to the shroud. BRB7 - Complete Upper and lower shroud (2" deep) OPTIONAL: BRB7-3A - Upper Fan Shroud extension (4" wide) BRB7-3B - Lower Fan Shroud extension (4" wide)