The U.S. aircraft register, updated daily
Parts

Universal Side

No failure report names the universal side. 4 FAA approvals let 2 companies make a replacement universal side, Eac Helicopters INC holding the most (3).

Approved replacement parts 4 parts manufacturer approvals

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

For these models most: Airbus Helicopters AS355 TwinStar (2), Airbus Helicopters AS350 AStar (Écureuil), now H125 (2), Robinson R44 (1), Bell 206 JetRanger and LongRanger (1), Aerospatiale AS-355 (1).

MakerPartReplacesFitsGrantedStatus
North American Surveillance Systems INCUniversal Side Mount 322USM1123-350Modification PartEurocopter France AS-350D, AS-350B, AS-350B12010-11-25current
Eac Helicopters INCUniversal Side Mount 322USM1123-44Modification PartRobinson Helicopter R442002-11-04current
Eac Helicopters INCUniversal Side Mount 322USM1123-206Modification PartBell 206A, 206A-1, 206B2002-11-04current
Eac Helicopters INCUniversal Side Mount 322USM1123-350Modification PartEurocopter France AS350B, B1, B22002-11-04current

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.