AMC / Javelin Horn button center repair

I have 2 of the 3 spoke steering wheels, and my center horn button clear plastic is cracked on one, and missing on the other. I have read somewhere, where you can use a clear circle from a craft store, and make it smaller, and use it, but, I cannot recall where I heard this, or what it is I am actually looking for. I also see this liquid on TV that looks like you run it in the cracks, and it fills them in, making it look clear again, but maybe it only works on glass. Does anyone have any experience in repairing these, or making the clear cover / lens? Showing mine for reference.

That is awesome, thank you for finding that for me. I knew I had seen it, just could not remember what it was called!

That's what I was looking for. I searched, but could not find it. I appreciate the help!

OK, I tried to score the inside edge, snap off the excess, and it did not look right, but even worse, when I went to put it in place, I cracked it across the middle. First failure! I have 3 more, so I am not worried. Is there a specific way you trimmed the edge down, and then installed it in the button? I searched for the repair, and it would only go back 1 year, so it is not showing up.

Cricket: In the photo I posted you will see a second package from Michael's "Medium Suction Cups."