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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.In order to determine which system you have you are going to need to contact Isuzu along with your vin number and that can look it up for you and tell you which you have. I think you have the SR180-1 but I would check with them to be sure.