I found the part I needed without difficulty and ordered it from an easily navigated website. It was delivered in a timely fashion.
Cross-over tube, ecr66/7200
Crossover tube for: ecr5200/6600/7200 (23 3/4") - limited stock 2x
Buy this part and as many parts as you like and pay only $9.99 shipping, within the Contiguous United States.