I cant speak about the others out there but the EPI CV boots are a good, quality replacement. One size fits all, think of it like this, if a one size fits all t shirt is it gonna fit you right and be the best fit the same as your grandma and the big guy donw the street. Chances are it will fit, might not look and feel right but can get you by. But if you can buy one that fits right and probably works better for the same or a touch more, why not do it.

 

Not sure how a One size fits all can work. My friends 2003 660 Grizzly has rear axles the dia. of a nickel,and I have rear axles the dia. of a Quarter. His stock boots would never slip over my axles and my stock boots would be so sloppy on his axles that the small band could never get tight enough to make a seal around a smaller dia. axle.

Then the front Axles are a smaller dia from the rear axles yet again.