Originally Posted by Lakers4Life
Wilson nCODE nSix-One Tour 90 Grommets (BLX Tour 90) - Interchangeble with BLX Tour 90
Product Code: GWNCNSOT90
This is what I got from a website. I think you need to look for BLX Tour 90 grommets.
pst90, n90 cannot accept grommets from k90/blx90/psblx90.
The sweetspot of pst90 and n90 is denser than the later generations.