Whats the rubber bit that goes around the bottom of the flash 'flashshow' called

[combat squirrel]

As title, I know, this is hilarious but I Have tried many variations of 'canon flash rubber connection cover' on google etc and I cannot find anywhere that sells them, ALL I need is the bit of rubber that goes on the bottom of the flash - mine is a 580 ex 2, where the hotshoe connection is just under the lock leaver.

 

[sk66]

It's a "rubber seal."

 

[Bondy]

Is this what you are looking for
http://www.uscamera.com/cy2-1814.htm