All E60 have them. iDrive will prompt you to reset them unless they automatically pair up.
Tire Rack sells Beru TPMS sensors for $50 each. Those will work. Comes with valve stem.
Audio: Jehnert Flatline speakers, Mobridge M1000 DA2 prepro, Helix P-DSP, Zapco Z-150.6 amp, CIC iDrive upgrade
Performance: MHD Pro Tune, AR Downpipes, ER FMIC/CP, DCI, RB turbos and inlets, KW V2 coilovers, Fuel-It Stage 2 pump w Ported fuel rail, Mfactory LSD