Clarification: I meant the series that replaced the "FW" and "FG" series when you look them up in Mouser, etc.
(Reply to Bud, who couldn't find "FW" and "FG" on DigiKey.)
Nichicon used to list them as "FW" and "FG" in their literature.
Now, they list them as UFW and UFG, and Mouser no longer lists FW and FG.