What mechanism do you mean - the jets? There are different jets between GT/GTI and standard/R32.
There's a post by mortygttdi which lists the parts you need, bear in mind there are loads of small parts needed for the hoses. I also put in a 5.5L bottle as it came pre-drilled, now have low washer warning too.
So, on top of the couplings, hose, rubber seals, clips etc you'll need a pump, bumper mouldings sprayed up, a fairly expensive Kufatec wiring loom and access to VCDS to program it.