There is one more type of rear radiator 

If you have a rear radiator type 4066, can you now replaces this with this bigger and more efficient rear radiator, you only need to replaces it is this part you can see on the photo. This kit fit to the rear bumper type 1316 or 1315

There is a small rubber in eats side, to hold the rear radiator in the top part no. 1640