thought you may be interested in this as it seems to come with everything done already (although cant justify the price nor postage silly yankees)
http://www.ebay.com.au/itm/Garrett-GTX2860R-400HP-Upgrade-Turbo-for-Nissan-Skyline-RB26DETT-R32-R33-R34-/250813255556
but if you are just purchasing the GTX CHRA cartridge then machining the front comp housing to fit will work IMO