Question about Drills for Sidearm Pitchers

I had a quick question about drills for sidearm pitchers. Are there any specific drills that work well for sidearm pitchers? Has any specific drill that is common worked well for a sidearm pitcher? Are there different drills that i have never heard of that are good for sidearmers? I ask this because there are a lot of drills out there, and some of them I feel, are not what I need or are helping my from my sidearm slot (i.e. the towel drill, which is hard to accomplish from a sidearm slot). If anyone could help me out on this I would appreciate it.