I have a Genteel calf strap and am using it on a standard 9452.18.33 which I had laying around for a couple of years, it's a very tight fit but workable. But if you have a 9452.18.83 made for a 2.7mm thickness, the 2.5mm Genteel should be perfect with it. Stay with what you have, better to have a skosh more room than not enough.
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