F109 is available in BMW thread dia. and pitch. Just get the right one and you will have no problem. I originally got a F109S, but have since chopped the nipple effectively making it a F109. I like the concept of F109SX if it is in fact shorter, but there are no specs for that I could find. Perhaps be a great idea to ping them and see what they provide. IMHO, the shorter the better.
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