are there any proper adjustable castor arms that will fit my 84 bluebird. after market or something off another sort of car?

I don't know how long your OEM arms, are but the LC/LJ Torana arms are suitable for the 510. You will also have to compare the bolt pattern at the LCA end too, to see if they are the same as 510/Torana.
The Torana arms are a lot thicker than the OEM 510 arms and therefore a lot stronger.
Don't be tempted to cut additional thread on the 910 arms
I tried that on my 510 and then noticed that instead of flexing the mounting bush, the arms were bending at the bush mount
The stock arms are too thin to do the job
Plus the threads are rolled in the factory whereas I cut the additional with a die.

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Regards, Graeme
Just trying to help...
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nissanman is there anything you dont know??? Awesome stuff

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Sorry for the (sort of) hijack, but does anyone know if the LJ castor arms will fit a Stanza as well?

I need new ones after I stuffed up the mounts and stretched the arms at the last rally, I'd like something a bit stronger so it doesn't break when I hit trees...

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Can't say for sure, but knowing Nissan and their parts compatibility record, I wouldn't be surprised that the Torana rods would fit the A10.
I can measure the OEM 510 rods if you want, then if you compare that with the A10 rods you may be in luck

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Regards, Graeme
Just trying to help...
http://nissanman.shutterfly.com/
graemes@internode.on.net

For rally conditions ( Stanza) you need to beef up the mountings first.
The mounts deform and alter castor.
visual inspection may not reveal initial deformation.
Even the works rods were subject to failing.
best to run safety cables.

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http://www.swmotorsport.com.au/index.php
you also need to buy the special bush for the pivot end
The rods are not listed on the web side but he sells them,
I've got them in my car

i have just recieved my adjustable castor rods for a stanza
But when i tried to fit them they have a different bolt pattern on the lower control arm end.
& the threaded section is alot thicker so im thinking i need bushings with larger hole.

I have attached some photos are the newer black castor rods meant to fit a stanza or are the 1600 arms??

The black ones are P510 pattern.

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Regards, Graeme
Just trying to help...
http://nissanman.shutterfly.com/
graemes@internode.on.net

Its all good i have sorted it out they do fit just have to use different bolt hole on the arm & larger 1600 bushes.