diff --git a/RhSolutions.AddIn/Services/CouplingsCalculator.cs b/RhSolutions.AddIn/Services/CouplingsCalculator.cs
index d32e026..79e72f5 100644
--- a/RhSolutions.AddIn/Services/CouplingsCalculator.cs
+++ b/RhSolutions.AddIn/Services/CouplingsCalculator.cs
@@ -38,10 +38,10 @@ public class CouplingsCalculator : IFittingsCalculator
             .ToDictionary(kvp =>
         kvp.Key switch
         {
-            "16" => new Product("11600111001"),
-            "20" => new Product("11600121001"),
-            "25" => new Product("11600131001"),
-            "32" => new Product("11600141001"),
+            "16" => new Product("11080111001"),
+            "20" => new Product("11080121001"),
+            "25" => new Product("11080131001"),
+            "32" => new Product("11080141001"),
             "40" => new Product("11600151001"),
             "50" => new Product("14563021001"),
             "63" => new Product("14563031001"),
diff --git a/RhSolutions.Tests/TestWorkbooks/TestSpecificationCouplings.xlsx b/RhSolutions.Tests/TestWorkbooks/TestSpecificationCouplings.xlsx
index 0acdf22..77335b9 100644
Binary files a/RhSolutions.Tests/TestWorkbooks/TestSpecificationCouplings.xlsx and b/RhSolutions.Tests/TestWorkbooks/TestSpecificationCouplings.xlsx differ