If you can read the numbers on the side of the struts, you can google them and order from Amazon or a host of other sources. If you cannot read the numbers, call Newmar and ask them for the specs (length of travel, pounds of force) and then go to Amazon. You can order them from Newmar, but you can most likely get them cheaper elsewhere. Pricing is kind of hit and miss at Newmar. When I needed the straps for my window awnings, they were the same price as Amazon. When I replaced the wiper motor, Newmar wanted $400+ and I bought it from Amazon for $112. They have always been very helpful over the phone even to the point of suggesting that I could find something cheaper elsewhere.
1999 Newmar Mountain Aire MACA 3796
2016 Ford Edge Sport AWD Roadmaster Sterling A/T Brake Buddy Select