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Remove two M6 screw and using a longer M6 (must be a 10.9 screws , not a soft ones ) screws to bolt a piece of respectable solid , at least 14 mm thick flat iron with a central M12 screw you can...

I have used many liqui-moly products, and would highly recommend them.
I'm guessing you are referring to his one?...

Doesn't work by clogging gaskets, it works by causing them to expand.

Here ya go mate.
http://i608.photobucket.com/albums/tt164/ferret/egrblockzd302-1.png

Here are the hose codes for any one that needs them these are Mackay hoses available from Super cheap
Suits Patrol rd28 6 cyl 2.8 T/diesel 10/97-4/2000
Top hose - CH2291
Bottom hose - CH2292...

I doubt it if a dealer would do this mod but a good off road workshop Should be able to.

Yes its a commonly done mod, in fact there is a spread on it here in the DIY section under: Nissan Patrol...