Here's a heads up: SPC arms are having real problems just now downunder with the joints rusting out. Apparently SPC are bringing out a greasable replacement due to multiple failures. I would stay well clear of SPC arms until this is sorted out and if you have them installed do yourself a favour and get them checked out. Not the sort of thing you want happening while getting along at a clip.
Perhaps Slee will know more on this. Apparently the ball joints are made in China and the rest of the arm fabricated in US?
Here's a pic of the replacement part they are bringing out - posted by Fab down on Lcool (also in his photobucket are pics of the joint failure)