PS for Darren, i am currently using Exotek items also (rear hub carriers, steering link, spring collars and shock bottoms) and all are excellent products as well.
Yes there is a tendancy of copying. In some respects it isn't even copying but actually that a main line manufacturer has parts tooled by another company who also sell under their own brand as well.
I guess its the finer changes, refinements etc that make them a companies product.
Will be in the market for spring cup's and servo posts this Xmas from Exotek also