hiya stevie
i've got one and find it really handy, eg on a cold morning you can start the car up, stick the TT on, lock up and do other things in the house while the car heats up (i dont use deicer or scrape the frost from the windows). Saves you standing around in the cold while the car heats up enough to clear the windscreen.
not sure how to fit them, it was on the car when i got her.
PS - can you bring the money for clothes on Sun if you are going to the motor show in Lanark