The U.S. aircraft register, updated daily
Parts

Inboard Fuel

No failure report names the inboard fuel. 4 FAA approvals let 2 companies make a replacement inboard fuel, Aviation Enterprises holding the most (2).

Approved replacement parts 4 parts manufacturer approvals

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

For these models most: Cessna T337 (2), Cessna P337 (2), Cessna 421 Golden Eagle (2), Cessna 411 (2), Cessna 337 Skymaster (2).

MakerPartReplacesFitsGrantedStatus
Aviation EnterprisesRight Inboard Fuel Tank AE1516133-341516133-34Cessna 337 series, T337 series, P337 series2004-08-26current
Aviation EnterprisesLeft Inboard Fuel Tank AE156133-331516133-33Cessna 337 series, T337 series, P337 series2004-08-26current
A/C Fuel Cells Worldwide INCinboard Fuel Cell Assemblies LH Dwg C3007-1Modification PartCessna 411, 4211995-04-19current
A/C Fuel Cells Worldwide INCinboard Fuel Cell Assemblies LH Dwg C3008-1Modification PartCessna 411, 4211995-04-19current

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.