I'm shopping a SMB I bought a while back and came across a plastic in the bottom of the cabinet.
My machine is apart right now and I'd like to find where this thing goes and put it back on.
The mounting holes are 30mm apart on center. I've taken a picture of that plastic and then some that are similar and already on the machine to try and cut down on any confusion or misidentification.
If you know where it goes and could upload a pic, that would be a big help to me. Thanks!

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Brainmegaphone is correct. I've got the position for the two clear plastics on the left side of the lower playfield, and I've got the location of the clear plastic between the two pop bumpers. The one I'm trying to find a position for is the plastic shown in the picture with the caliper.
I'm assuming that someone shopped this in the past and forgot to put it back on... and maybe due to the location it would have been hard to go back and put it on so they just threw it in the bottom of the cabinet. Maybe.

Good call, Scotty! I didn't even to think of checking Marco's for a pic of the set. All the plastics shown there are accounted for. You're probably right, this must've come off another pin and ended up in the bottom of my cabinet during its adventures. Must be another Gottlieb plastic or something.
I'm finishing up cleaning everything now and will go ahead and put it back together this afternoon.
Thanks for everyone's help!