I would guess it would be the same as all other years of CRF450 Clutch Basket Center Bolts (even back to the CR250 two strokes) , and be around 80 Nm/59 ft lbs , you should be good with that setting
Sorry that im jumping on that post,
But do you have any clue whats the difference between the crf450l 2019 basket to the crf450rx 2019 basket?
Or you can send me a photo of yours?
Thanks