Found this little rubber stopper on garage floor, any ideas?

[Smokebombb]

Hi GS folks,

I found this little rubber stopper (I'm guessing that's what it is) on the ground under my bike:



I have a 2004 GS500F California model.  I found it after changing my air filter, oil + oil filter, and inspecting the spark plugs.  Any ideas where this may have fallen off from?

I fiddled around with the carb vent hose a bit while trying to screw in the air filter.  Might it have fallen out of this hose?:



Thanks.

[TragicImage]

need something for size reference.

[mike_mike]

cap for the mirror mount on the bars possibly.

the F model has them capped off.

[Smokebombb]

Thanks Mike.  That was the source.  Here's a pic of where it fell off:

[domas]

California people dont need mirrors?

[CirclesCenter]

Yeah cali bikes need mirrors,

The F models have the mirrors mounted somewhere besides the handlebars though, but since I have an E I dunno where that is.

[aaronstj]

Mounted on the windshield/fairing.  Just google image search gs500f.

[The Buddha]

That's right, you guessed it ... its a butt plug ... 
Cool.
Srinath.

[Onlypastrana199]

That's right, you guessed it ... its a butt plug ... 
Cool.
Srinath.

that made my day Srinath thanks

[natedawg120]

butt plug

[The Buddha]

Someone else has posted that before for the exhaust rubber thing.
Cool.
Srinath.

[pandy]

That's right, you guessed it ... its a butt plug ... 

*wiping off monitor* 

That's the most coherent thing you've ever said, Srinath, and someone might have said it before, but it's SO damned funny when YOU say it!     

[Unnamed]

I'd be more worried about that penny that fell out of the bike.