2010-2012 Mustang GT Rear Bumper Cover, Lower Valance, Supports and Equipment Branches

Checked mounting-bracket chains include AR3Z-17D942-C -> CR3Z-17D942-A and AR3Z-17D943-A -> CR3Z-17D943-A around the documented 05/2011 production transition. AR3Z-17D943-B belongs to the separate 17D995 reinforcement callout and follows its own checked path to DR3Z-17D943-A. The outer cover's AAPTM and AACP suffixes are service/crash-program variants, not evidence that every lower valance is shared. AR3Z-17F828-BA, BR3Z-17F828-AA, CR3Z-17F828-DA and AR3Z-17F828-AA are equipment/build branches, not one universal supersession chain.

Confirm VIN, build date, GT trim, coupe/convertible, original appearance/special-equipment package, reverse-proximity sensors, exhaust outlets and every installed number before ordering. A primed outer cover is not a complete rear bumper: lower valance, supports and side brackets, clips, screws/rivets/nuts, impact beam and isolator, parking sensors/harness, paint and deck-lid trim are separate unless explicitly included. The checked rear-bumper diagrams do not catalog a bumper reflector or rear badge for this 2010-2012 assembly; the deck-lid emblem/faux-gas-cap panel and rear lamps are outside this guide. Do not add a reflector or badge to a bumper order from a generic listing title. Ford TSB 09-24-15 identifies a fit/alignment condition on certain 2010 Mustangs built on or before 2009-09-15 and an updated side/lower bracket procedure; inspect brackets and quarter-panel alignment rather than assuming the flexible cover alone is defective.

FO1100661 is the checked aftermarket reference for the primed outer cover corresponding to AR3Z-17K835-AAPTM. Aftermarket cover listings can omit lower valance, brackets, hardware, sensors and paint and may arrive folded; verify material, CAPA status where claimed, exhaust/mud-flap openings, return/freight policy and paint preparation. GT500/Boss/California-Special-style AR3Z-17F828-AA is a different factory appearance branch, not a generic upgrade included with a standard-GT cover. No conversion fitment is endorsed.

This guide covers 2010-2012 US/LHD Mustang GT outer rear cover and equipment-specific lower-valance/support selection. Match VIN, build, original appearance/special-equipment package, reverse-proximity sensors, exhaust openings and installed numbers. AR3Z-17K835-AAPTM is a primed outer cover, not a complete bumper. AR3Z-17F828-BA, BR3Z-17F828-AA, CR3Z-17F828-DA and appearance-group AR3Z-17F828-AA are distinct build/equipment branches; the appearance valance must not be presented as standard-GT fitment. The checked bumper diagrams do not place a reflector or rear badge in this assembly, so deck-lid emblem/faux-gas-cap trim and rear lamps stay outside the order. Brackets, clips, beam, isolator, sensors, harness, valance, paint and hardware may be separate. Ford's fitment TSB applies only to certain 2010 cars built on or before 2009-09-15 and calls for bracket/alignment inspection. Used or folded covers need careful tab, deformation, paint, repair and sensor-hole inspection; structural crash damage requires professional assessment.

Supersede reviewed 17 unique research sources for this guide. 9 also appear above as a seller or official action and are not repeated here; 8 additional citations follow.

Research last verified 2026-07-27.

1. Fordpartsgiant — rear bumperOpen source
2. Fordpartsgiant — rear bumperOpen source
3. Fordpartsgiant — rear bumperOpen source
4. Ford — bumper extension p4000048629Open source
5. Charm — Body Poor Rear Bumper Cover FitOpen source
6. Ford Service Information — 10musog2eOpen source
7. Ford Service Information — 12musog1eOpen source
8. Oemfordpart — body bumper and components rearOpen source