Ramair filter IAT sensor hole size ?

I have been trying to purchase a rubber washer as shown on the parts list.Ramair are saying that the
hole for the IAT sensor on the early filters were a larger hole and that was the reason for the washer.

Is there anyone that knows for sure if only the early filters used the washers..I think the early filters had
a problem with cracking.

If you use some self amalganating rubber tape , you can wrap it around the sensor until you get a nice tight fit ! when you refit the bear claw, put a couple of small washers behind the mounting tab at the rear of the tank . this will help stop the foam of the Ramair chafeing against the bear claw , or some self adhesive reflective foamed foil . the type you put behind household radiators to reflect the heat . stuck to the inside rear of the bear claw ., will do the same thing . with the bear claw in place , it touches the foam on the number 3 throttle body and vibration does a good job of fubaring it !