What is this and where can I get a new one cheap!

[Bubbafunk32]

I took down my airfilter on my 1975 cb750 super sport and this Gasket came falling out and is real rough shape. It was on the seperator part inside the airbox I called my local Honda dealer and he said that it would cost me $65 for the part! For a piece of rubber? Does anyone know where I can get a new one or what to do. Can I run the bike without it? I Reassembled the filter inside the airbox and took it for a ride and it sounds like when you flip an aircover on a 4 barrel.
I know it needs the gasket but I just don't have a clue as to where to find one
Thanks

Here's some pics of the part

[Tech78]

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[CB750Winger]

  I would agree with Alan, or try getting a piece of window weather strip at an auto parts store and glue it on or use double sided tape.   Paul

[dylansdad022102]

i do believe the reason it cost so much is it comes with another plastic piece that  it mounts too. but try bikebandit.com