Chatted with customer service on what part to buy for our bbq. Very helpful. Gave me the exact page for our bbq. Very easy purchase!
Duct assy brisa window
Bw4001/02,bw4501/02, bw5001/02, bw5501 dimensions: 20.75 x 13.25 x 10
Buy this part and as many parts as you like and pay only $9.99 shipping, within the Contiguous United States.