The Rolex crown, 24-703-0, and tube, 24-7030-0, have been copied by the rep people and are very accurate. You can compare the BK crown to your gen and then decide if you want to change or not.
On the PT 1665, the tube is fine, but the crown is a tad too tall. I ended up switching out both since I boogered up the tube trying to take it out. It is easier to trim cg's w/o the tube in your way. But w/ a BK WM9 you don't need to trim cg's!
Good luck.