i've been looking for something like this foreverEscape gear from Equipt. They now list 35 inch. I have a 33 inch on my BJ74 and I love it. I will be getting a 35 for my 80.
Spare Tire Cover - https://www.equipt1.com/collections/escape-gear/products/spare-tire-cover?variant=32674141372479
ordered, thank you!