Reptile basics has dividers available that I believe are made to fir the 32qt tubs: http://www.reptilebasics.com/reptile-rack-systems/
Hope this helps, I considered getting these myself, but found a rack that holds both 32qt and 15 qt tubs, so didn't need them. Also, depending on how the rack is set up, you may be able to use qt tubs with it. Good luck.