rwdkev is right. My 1993 960 (380k miles) still has the original fittings and, I have replaced the radiator twice and they come with already drilled holes for the self tapping screws in the "lower rail" of the rad. The screws should bottom out before they get close to the matrix but I always check when securing just to make sure. The "lower rail" is a length of aluminium "U" section about 1cm across the mouth, attached as part of the radiator.
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