[sourdough]

There should be information on the strut on the side. If it has been working well go with the same pound rating, if not you can raise or lower the resistance but do so with both struts. Measure the length and you can sometimes find them at an auto store or get them online. I've purchased them at various places over the years but the only one I recall is rvupgradestore.com. None I have purchased was ever $52.00.