Message 3540, May 23, 2004
Rico, They are the same shell just different designation. HGU-68 shells are PRU-55/P and the HGU-84 is PRU-59/P. The different designations and part numbers is due to the configuration of the shells, that is the holes that are drilled into them and the PRU-59 does not have the "elephant ears". HGU-84 extra large wide are sometimes used for those fixed wing flyers with heads too big for the extra large PRU-55 shell. Only difference is all 84 parts are removed, holes filled in and new ones drilled for which ever configuration of visor is needed and for the mask receivers.
Spanky