Because you want the same as you have now, Newmar would be the best place to start. They can provide valuable information about how to make the replacement. Consider calling the parts department first. Have your coach number. There is a lady there who knows all there is to know about components for Newmar coaches.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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