Personally I would not fit Kev's spacers with a progressive spring like the Hyperpro; they were designed for use with the stock linear spring to increase preload.

If you fit them with progressive springs all you will do is 'squash out' the first part of the lower rate end of the spring's range and push it into the higher rate end with no change in static ride height at all. You will more than likely find the result is a harsher ride and end up with the progressive spring rate functioning over a narrower overall range.

Progressive springs are normally supplied with a slightly longer free-length than the linear springs they are designed to replace anyway, negating the need for spacers and account for the 'softer' initial travel.

Setting preload and sag is a quite a complex art with progressive springs and isn't as simple as just chucking in spacers with linear springs.

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