While I agree I do have to recognize there are people who may have to deal with these issues in quantity as fuchsdh appears to have had (has) to do. I don't want to dismiss his experience merely because most may not have to deal with the situation.It's worth noting that in a high percentage of cases, only the people manufacturing the systems deal with the baffles and shields.
Companies tend to buy them configured to go, and discard them on a predetermined replacement cycle. (My company contracts for the 3 year on-site warranty, then replaces them in 3 years.)