I can't decide if even posting this is going to get me nailed as the biggest bodger on the forum, but for what it is, if you are going with a good quality sensor, I'd be tempted to remove the remnants of the old one and then you could probably use a spot of glue to fix the replacement leaving the old bolt in place......
Worst case means you can't remove the sensor without damaging it..... the same sensor that was in there for 20 years and had become so stuck it may as well have been glued in
Flame away