Koni yellows will tend to be firm, even when on the soft settings. For stockish spring rates, the Tokico Blue shocks are decent replacements. I was even happy with some Monroe shocks on my first CRX for a good while.
Springs are, IMHO, pretty standard. If you find the right rate, the right length, the right diameter, and the right end finish, you should be able to get them pretty much from anyone. The super-duper cheap places maybe not, but as long as the steel they're made from is decent the spring should be fine.
-soD
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