What do you mean by "piece out of slider"? The slot that is missing, can you just cut it in? That part after all only slightly supports the slider.
Just modified photos.
Not going to easy to ‘cut’ a slot in without making comprising it at that point.
‘Piece out of slider’ is no missing in bottom photo
Well I'm doing the YZF600R rear wheel conversion so I'll probably get one so I don't damage the swing arm and have to redo the rear with a different swing arm package for such a disposable part. Thanks to Hot Foot for even attempting this project.