Bodykits hack

I would like to know how to hack a bodykit with a spoiler/wing like the ones on Toyota MR2 Gymkhana edition and Lambo LP640 Treasure Hunt edition.

That spoiler is very nice for me but I don't know how to hack. =(
I can only hack those can be bought in the shop

I thought they were available during the Beta. or during the old customization shop.

Noone is able to install that goddamn bench and it's great.
Contact someone like vitaleks if you really want it.