The V6 brake caliper will not bolt to the 4 stud knuckle, the bolt placements are different. Both 4 and 5 stud knuckles will bolt directly to the suspension strut, lower 'A' arm and steering arm and so are interchangeable without altering any suspension components.
The hub (the bit that rotates) can be swapped between the 4 and 5 stud knuckle so you don't need to go 5 stud to get the bigger brakes, this means you will need to either have an undrilled V6 disk drilled for your 4X100 studs or find a disk that is close enough with the 4X100 already drilled. Some people have apparently used the NA Mx-5 disk.
--o0o-- OR
Change to the V6 assemblies front and rear and buy new wheels.
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