I think that this is what you’re looking for. http://2btherapy.com/index.php/bikes/brake-therapy-conversion-kit
I would check with the manufacturer to make sure it’ll work with your HG.
I think that’s from the 2000 model year, although it could definitely have been sold as new in 2001. Homegrowns from 2001 had IS disc brake mounts. It looks like your bike has 22mm Hayes mounts.
I sold the yellow homegrown comp on ebay. I was disappointed with the low price. I should have waited until later in the season. In any case, I think the frames with the bass boat paint jobs are in greater demand, even if they are older. That said, I paid close to $300 for a 19″ 2001 homegrown factory in matte black. That probably says as much about my spending habits than the greater market.