I love the kit from gt pumps that uses the -AN fittings, its costs more but if you take your turbo off again even once, it saves the hassle of getting the stock style one to seal. I fought with mine a bit and so did a mate. You can take the turbo off and leave the fitting on the turbo so you don't need to re seal it every time, just undo the -an fitting. Makes it so simple and don't have to try re goo it in the awkward spot.
Either way you choose, Toyota black sump sealant is awesome stuff and should save the leaks.