The U.S. aircraft register, updated daily
Parts

Rigid

No failure report names the rigid. 1 FAA approvals let 1 company make a replacement rigid, Microtech 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 rigid and sell it as an approved part for the models named. These are the companies holding such approvals for a rigid:

For these models most: Boeing 737 (1).

MakerPartReplacesFitsGrantedStatus
Microtech INCRigid W/G Assembly 23499510-60897-60Boeing 737-200 series2003-10-06current

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.