Convert RACK_WIDTH_CHOICES to ChoiceSet

netbox/dcim/choices.py

@@ -30,6 +30,17 @@ class RackTypeChoices(ChoiceSet):
     }
 
 
+class RackWidthChoices(ChoiceSet):
+
+    WIDTH_19IN = 19
+    WIDTH_23IN = 23
+
+    CHOICES = (
+        (WIDTH_19IN, '19 inches'),
+        (WIDTH_23IN, '23 inches'),
+    )
+
+
 #
 # Console port type values
 #