Freelander rear armrest cupholder

I just noticed flipping through my '05 freelander manual and stumbled across a rear armrest cupholder. Either I was blind when I read the options booklet but I didnt bloody see any rear armrest cupholder as on option. If it does exist, where can I order this piece and should i let my dealer install it or is it fairly DIYish?

order from a dealer and fit it yourself, shouldn't be too hard

Doesn't this option do away with the middle back seat?