If you don't go with auger ash removal (or until you do) the 'Behrens' model # '1GS' , an 11 gallon round galvanized steel tub fits my AHS S130 perfectly. I would assume it to also fit the AA-130.https://www.behrensmfg.com/products/tub ... round-tub/
If you have any 'Rural King' stores in your area, they have them at a good price. 'TSC' may also carry (or be able to get) theses.
The 'Behrens' website lists them at 20.5" wide by 11" tall, but both mine (5 years old) and a brand new one that I measured at Rural King a couple days ago actually measure exactly 20" wide by 10-3/4" tall.
The company that made the square galvanized tub that came standard with my AHS S130 (Dover Parkersburg) went out of business a few years ago. I have not since located a square tub of its specific dimensions anywhere. But the round '1GS' tubs work every bit as well, since the ash sled cuts off and drops the ashes precisely at the widest 20" midpoint cross-section of these round tubs.