I assume they're size codes, but I can't find a conversion chart. These may be foreign rings.
Usually numbers like this would be cross-referenced though a diagram to a table. You'd see an overhead picture of the playfield a near-bye dark circled number corresponding to a size chart.
I am guessing you are lacking documentation?
http://www.pbresource.com/rubber/rubberchart.jpg
https://user.xmission.com/~daina/tips/pub/tip0117.html
These may help if you have to fall back on taking measurements.
Oh, since this is a foreign game, those could be the measurements in mm.
[edit]: Then again, maybe not. Some of those measurements would seem somewhat odd being that close together.
If you don't find a more logical reason: Most likely they are the mold cavity numbers to ID which cavity the part came from when made. They use multi cavity molds and good mold designers will put cavity numbers in there to help troubleshoot molding problems.
Unfortunately, the manual does not have a ring size and placement chart. Because they're mostly bent out of shape, I slipped them over a red Solo cup to get them round again and just measured them there. Backed down a quarter inch or so to compensate for stretching and I'll go from there. Thanks for the advice, gang.
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