Unigrass 6600
Hello,
Our closest option would be the 32-061 self-closing drawer slides. Note that the measure 21-5/8" long. Review the specifications to see if this could work for your application. Thanks for posting!
Unfortunately, we can't predict the results of installing shorter tracks. It's possible they may not work at all if you're not able to attach them to the front of the drawer. These tracks are often used with rear brackets like the 32-089, which has a 3-11/16" projection, which could compensate for some of the difference in length. Again, we can't make any guarantees, but this would be our best replacement option. If you decide to give it a try and run into any trouble, our return policy can be found here.