SamQ has done this conversion man, so would be a good idea to get in contact with him and or check his worklog.
If you want an answer right now what you could do is get two pieces of ally, bolt them to the rad support panel in front of those two pieces of plastic that stick straight up vertically from the radiator. If you know what i mean lol. Then just drill a hole in both pieces of ally to make room for those stick up bits and your laughing.
That is how they are supported from factory, its just a bit more of a ghetto setup. Ideally, get some mounts from a wreckers as they have the rubber mounts in them and just space them up and weld or bolt them to the rad support.
Hope that made sense, if i wasnt so flat out i would draw what i mean... I'll try to get around to it soon.
Hope it helps man.