A long while ago, I had replaced these caps, and now they are yellowing, and thus am interested in getting a new set. I had purchased such a set from a few vendors (and returned them) because the quality was bad - i.e., the holes are way off-center, making it unacceptable to me. Here is such a set:
https://www.ministryofpinball.com/en/playboy-bumper-cap-set.html
I wonder if anyone will be a good-quality set.