By plastic cover, do you mean the gaitor that goes between the underside of the gearknob and the plastic trim in between the seats?
If you have a Sunny, it's a rubber shaped thing, whereas the Pulsar one is a leather drapey thing.
I can't remember how it works, but i had to get a new one when i first got my car, and i can remember it was a extremely easy to sort out. Just take off the trim at the bottom of the gearstick (prise it up with a flathead screwdriver, then just literally pulls off) and have a butchers at it. If you want to get it all the way off, you'll need to unscrew the geraknob, which on my car was an absolute pig.