The U.S. aircraft register, updated daily
Parts

Auxiliary Cabin

No failure report names the auxiliary cabin. 3 FAA approvals let 1 company make a replacement auxiliary cabin, Aero Improvements holding the most (3).

Approved replacement parts 3 parts manufacturer approvals

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

For these models most: Cessna T-310 (1), Cessna 310 (1), Beechcraft V35 Bonanza (1), Beechcraft S35 Bonanza (1), Beechcraft P35 (1), Beechcraft N35 (1), Beechcraft M35 (1), Beechcraft K35 Bonanza (1), Beechcraft J35 (1), Beechcraft H35 (1), Beechcraft G35 (1), Beechcraft G33 (1).

MakerPartReplacesFitsGrantedStatus
Aero ImprovementsAuxiliary Cabin Door Latch Pin and Socket 9334Modification PartBeech Raytheon) (33, A33, B331994-08-03current
Aero ImprovementsAuxiliary Cabin Door Latch Pin and Socket 9335Modification PartBeech Raytheon) (55, A55, B551994-08-03current
Aero ImprovementsAuxiliary Cabin Door Latch Pin and Socket 9328Modification PartCessna 310, 310A, B1994-02-28current

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.