2015-2023 Ford Mustang S550 platform lowering kit with BMR Suspension fixed rear upper control arms and rear shock mounts. The lowering kit (springs) is Ford Performance part #M-5300-X. I purchased this for my 2018 Ford Mustang GT to lower and improve the suspension. I sold the Mustang before I could install and all parts are brand new. I paid almost $1k and the internet informed me that a quick sale price would be $600. I am asking $500 for all in hopes someone can upgrade their Mustang! Please call if you have any questions. I really don't want to ship, but can probably meet a serious buyer in CDA or Spokane. Cash only, no trades.