Hi Todd, you can buy replacements just about at any RV parts place.
Burro didn't manufacture your icebox, or anything else except the body and frame. EVERYTHING else came from a different manufacturer. Same goes for
Scamp,
Casita, etc.
Shop around (S&H CAN be a killer) for best prices and definitely make sure the dimensions fit the cutout for the ice box and stove.
Best of luck