The U.S. aircraft register, updated daily
Parts

Gusset Side

No failure report names the gusset side. 1 FAA approvals let 1 company make a replacement gusset side, Elmo Air Center INC holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a gusset side and sell it as an approved part for the models named. These are the companies holding such approvals for a gusset side:

For these models most: Bell 407 (1).

MakerPartReplacesFitsGrantedStatus
Elmo Air Center INCGusset Side Mount 407U40014Modification PartBell 4071998-07-08current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.