I am looking for the small plastic tabs that lock the battery cover in place. A parts guy at my local dealer told me I must buy the entire battery box cover, to get the locking tabs ($110.00). Is that true? Does anyone know if the Tabs are sold as a indivual part? Also, does the Z4 Roadster and M Roadster have the same battery cover and tabs as my M Z4 Coupe? Thanks Rich 2007 M Coupe ( Missing a battery tab)!