Hey Patrick,
We can get you replacement double-eye leaf springs for your 2020 Grand Design Reflection 31MB, though unfortunately we don't have any way of knowing what specific ones you need. That said, it's pretty easy to determine, as all you need to do is measure your current leaf springs from center-to-center of the spring eyes, and you also need to know the weight rating of your axle (which should be printed on a sticker or tag on the axle itself).
Leaf springs also flatten a bit... view full answer...