There are a few cue manufacturers that exclusively use Everest tips.
Those tips are 8 layer rather than the 10 layer tips you buy in retail/online stores and will season and play different.
SO...which tip are you trying to replace?
If there is any tip I suggest you try for likeness of hit I will recommend a SIB tip or cuesoul has a lot of good tips in 8 and 10 layer.
Rob.M