Up for sale here is this set of 4 parts. There are two big aluminum cooling chimneys for transmitter tubes, as well as two other parts that appear to go together. I got these in a box of transmitter tube sockets, so I am guessing that's what they are all for. Please see my pictures for
details and dimensions.
US shipping and handling is $8, and international is $28. If you have any questions, please ask.
I have more sockets and other vintage electronics listed--feel free to take a look!