Thanks for the suggestions. Still haven't found what the
home-improvement web pages mention, however. The "mudring" appears
from the pictures to require welding to the original box, and attaches
to the boxes' bottom. The MSC unit is not adjustable, and is the same
as what I found at Lowe's. Home Depot was mentioned but is one of the
web sites I previously searched, with no luck.

-dan z-


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