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Thanks for your post! We do not have a direct replacement match for your bubble seal but our 58-053 or our 58-114 may be worth considering. The kerf mount on it is slightly thinner but there is a chance one of these may work. The black gasket or spline reminds me of either the 59-067 or 59-068.

To determine if any of these could work for your, carefully look over their dimensions on the website and compare them.