No kettle is too old to add an ash can assembly.
@btomlin Simply mod the ring with some strips of sheet metal and bend the tabs to fit the sockets.
It is usually just one leg socket that is offset that and the tab mod is bent to insert into it.
Notice how the tab on the top is bent to insert under the socket
This is a 22" Master-Touch ring modded to fit a 26" Flat-top. Have a rusted out support bar? Dump that POS part and do the tab mod and never look back!
Here is another MT ash can assembly modded to a 22" Silver.
Notice how the top R tab is bent? This mod makes the whole shebang removable without any drilling into the kettle.
Here is an 18" "G" that I took and dropped a late model 18" OTG assembly on. The vents on the older model 18's are slightly larger than the new 18's and I had to trim off a section of one tab and slightly bend to fit it into the socket. You can do this on later model OTG's to 22's as well.
Wiring, screwing or hose clamps are hack mods!