Are the front sway bar end links longer or shorter than the rear sway bar end links??????

 

Same. They are identical part numbers for front and rear.

 

I've heard you should run shorter ones if you have lowered your car, is this true??

 

If you wanted to maintain the same relative position of the sway bar to the chassis, then running shorter ones would do. Though I have to say that I have had no issues with my car dropped a little without changing their length (though I did consider doing it).