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I believe the seat rails raised to clear the DME under the seat with the start of the 84's but do not know this to be fact. In 1986 the seat rails were lowered to give more head room.
In some or later years Porsche did have an option to lower the seats that was mostly just putting less padding in the seats I believe.
If you are trying to fit a helmit you might try removing the sunroof liner and sliding it back into the back of the top. I did this and put my seat up so I can fit my helmit up in the opening. It has made things more livable but is not an great solution.
I think Recaro's can get about 1" more clearance with slider rails. Maybe almost 2" w/o sliders but not confident in this.
So to answer your question, I do not know if SC seats will lower you but I suspect not unless you modify them. It might be possable to take the lower apart of not electronic and chop and modify the bottoms to make for more room.
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