Product review (5 stars): ended up with an extra.
I bought this one and also the Lasco 39-9057 Whirlaway and Sinkmaster Disposal Replacement Splashguard.  Not sure if it was an error in shipping or what, but i ended up with two of each.  the stopper came with the splash guard, and the splashguard i bought came with a stopper.  Guess i have a backup now in case it breaks....probably not worth trying to return one.