Thank you! Glad to hear this, I'd rather have a tight seal to keep out bugs.
The filter I used was this one:
https://www.amazon.com/dp/B0D1718C4V...fed_asin_title
States it's compatible with the 1250, but I'll order a genuine Kohler. Any chance you do have the correct filter number that you could share when you have more time at hand? There are so many superceding part numbers, I don't know where to begin.