You need to look on your existing gearbox for the specific variant code. It's stamped into the casing on a flat section at the back, near the dogbone IIRC.
All of the manuals in the MK5 are the O2Q model, but there are variances for R32, diesel and GTI. Pretty sure the same box is fitted the GTI, Pirelli and ED30 though. R32 has shorter gearing iirc, if that takes your fancy. I know it does me. The stock gearing is way too tall.
The Helix clutch is OK if you get the newer one with their own billet cover plate. Their older kit which uses the Sachs sporting cover plate is f'kin terrible. Don't ask how I know.
There's a lot of internet hoo ha about DMFs being a necessity to absorb damaging engine harmonics, but many people are fine with SMFs. I guess the long term effects aren't known yet, but I f'kin hate DMFs. They are an utter abomination.
My clutch (helix) and DMF are fooked and due for replacement. Think I'll be going down the TTRS cover plate and OEM MK5 disc route personally, with a new OEM DMF. Pattern ones are garbage and last 2-3 years tops. Again, don't ask how I know