There is a really good thread here about ABS sensor replacement.
https://the75andztclub.co.uk/forum/s...=252858&page=4
I posted some pictures of mine (post 37) showing how I had to use a file to clean out the hole sufficiently to get the sensor in. They should push in without being too tight to allow it to seat properly. You may have to clean up the area around the screw hole as well. This builds up with rust and stops to the sensor from seating properly. Good luck!