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MNBoxster: Maybe so on the part numbers for it being a 987 part. As for the 4th hole and using only the 3 hole....
I didn't take pictures of the back portion but structurally and design, the mounts are the exact same. Especially a pic from the rear of the two, one can see that both mounts were almost identical in design, same metal skeleton lines, same cast and same design as the original only differences between the 3 bolt and 4 bolt was the vented holes on the new one, a sturdier metal compound, and of course the extra hole for the 4th bolt.
I do not see as to why it would not be beneficial, wrong, or harmful to install the 4 bolt mount. The part was made to be obviously interchangeable.
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Threaded Mode
