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Hi - when I replaced the failing fan clutch in our 08 Winnebago Journey with 6.7L ISB 2007 EPA engine, this is the spacer that I used:
Cummins fan spacer 3910130 Case NH 76605660 OEM
The 'old' spacer with the clutch was 1.5" deep, and the one which gave the proper depth with the Source Engineering fan was 2" deep. It was a perfect fit with the Source Engineering fan which I purchased directly from Source Engineering.
The depth has to be such that the fan itself is centered within the fan cowl/housing so that it is half in/half out, and not all the way on one side or the other of the housing.
Depending on the depth of the fan itself and the specific install, the depth may vary, so the part depth may also need to be varied.
This makes it difficult to tell you precisely which part to order, but I am happy to share what worked for us (part number above). If nothing else, it at least gives you a starting point with part numbers, photo, and precisely what the part is called.
Best of luck.
Here is the part number for the Fan. The spacer was custom made. They made the spacer using the part number for the clutch fan and the measurement I gave them for the spacer that was between my pulley and the clutch fan that you can see in the picture. It works good I have been about 1000 miles with it so far and temp ranges from 192 to 202.