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Not sure who still has the oem Lexus pen that came new with the SC300/400's, but I discovered yesterday that apparently the company CROSS made the pens for Lexus in the 1990s and early 2000s.
If you still have it and it's long since run out of ink, just go to your nearest Office Depot and get the CROSS ballpoint pen refills with the part # 8513-2
These are my 2 pens. The top one came in my 2003 IS300 and the bottom pen came in my 1997 SC300