Your 2008 Saturn Astra uses a type 921 backup light bulb so the Hopkins Backup Alert, # HM20101VA, that was designed to replace a 3156 bulb will not work for you but I do have a solution. Check out the Custer Surface Mount Back-Up Alarm, # BK97DB, which provides a 97 decibel alarm when activated. This alarm can mount to the underside of the bumper and will wire into the reverse light circuit of your Astra. view full answer...
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