They were an optional extra (think it was called the 'storage pack' and included footwell nets and something else that I can't remember!). I had them retro-fitted to my old Roadster but I didn't bother on the M Coupe because I thought they were rubbish.
I retrofitted them to my last car, but this car doesn't have them either - one of the only things I need to do, so can't complain. I liked them, but Wee Bing used his more which I approved of on long road trips.