The KunaiGC will work on every version. But only the DOL-001-Version (that one with the Digital Out-Port) are being sold by the shops.

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It's only a matter of the KunaiGC placement on the DOL-101 mainboard.

Now you need an KunaiGC. The KunaiGC-Boardfiles are available in this GitHub-Repository so you'll be able to order the PCBs and all needed components by yourself. On the other hand you can buy a modkit at one of the shops mentioned in the readme. The soldering is quite easy, if you've done similar things before.

And a quick note: You do this mod to your Gamecube on your own risk! We are not responsable for any damage, that happens during installation.