First off, why the swap out from the contour fan? Does it not work, too noisy?
To use a fan clutch, I think the CJ uses a larger 7 blade fan and the Wrangler uses a smaller 5 blade. The radiator will have side brackets that are set further out so the body of the radiator is deeper in the grill. These are usually HD 2 core versions with the fill cap offset to one side. You will also need the shroud as well.
You can also do the fixed fan that is 4 blade, has a small spacer and no shroud . That radiator is a center cap and sits closer to the fan.
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon