Only 4 AAM4's on f15J(M)

Is there any reason as to why the Japanese f15J(M) can carry 8 AIM120a’s, but only 4 AAM4’s?
Its an issue easily fixed by making a preset with AIM120’s on the pylons where AAM4’s unavailible but still.

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AAM-4 is bigger and heavier than AIM-120.