A few interior questions......

Hello everyone. I have recently bought a 3rd party armrest for my Fabby estate (As I'm getting old and everything aches after ten minutes of driving!) 

http://www.ebay.co.uk/itm/121746233541

I bought it because someone on here (a while back, I think) said it was a good fit and looked pretty OEM in the Fabby. I'm impressed with it (and for £20, who can argue?) Sadly, it doesn't come with any fitting instructions, and it looks like it just drops into the cup holder and screws in. Has anyone fitted one, and managed to make it secure?

Also, My 'Bohemia' seats are taking a right pasting in the short time I've had the car, so I'd like to get some fitted seat covers for the front, before I wear them down to the bear metal frame. I used the 'site:briskoda.net skoda fabia seat covers' search on Google, but a lot of the threads are years old, and the covers are DOA. I have bought these before for other cars, but the fit was a bit 'baggy'!

http://www.roofbox.co.uk/scripts/rbvehsel4_tab.php/seat-covers/walser_jacquard_seat_covers_front_seats_only_dotspot_11938/Qx%40w%2C6M42VAwp3%40Rb{~cC4urewuabEs6kPkC8vD2~ZD

I'd like fabric, but don't mind the waterproof ones (Unless they look like a old bin bag!) I'd like them to be as OEM as possible. Many thanks in advance