The one item you can find any place is PVC.sch 40 or 80.two 8-or- 10 in. "T"s cut thru-top off, add carpet, set to fit your present axle.
May not look factory, but works, you will have a set to use while you wait for proper units and costs next to nothing.This may not be the ans you wanted, but hope it helps. You are welcome to a few pic's if you wish.