Wasn't there a stipulation that the vocals be removed? Seems to me that originally he used it at times with the vocals.
"Briefly in 1999, Limbaugh was forced to suspend playing the song while negotiating with Hynde. Hynde eventually decided to allow Limbaugh to use it, with Limbaugh paying Hynde approximately $500,000/year which she donates to the animal rights organization PETA. Hynde explained that she doesn't agree with Limbaugh but her parents are big fans."