My BA XR6T is currently at the mechanics getting some Nizpro valve springs installed. Now the mechanic rang me and asked why the shims that came with the springs were different colours and sizes. So I said hold off, and rang Nizpro. After a bit of a discussion on my power figure and such, Nizpro fella told me to re-use the original shims, as the nizpro supplied shims could cause just a bit more stress on the spring. To put my mind at ease, has anyone used the nizpro spring and the standard shims from the BA? Just.. kind of stressing a little, seeing as I told the mechanic to use the standards, and hes nearly finished. Any help?