To be very respectful I am not sure where exactly to be start on this issue. Those who know me know I am always looking for 2100 clutches. I have yet to find any in several years after several posts. As for your question I believe you will find the 2000 uses a 5/8" shoe. That is easy to find. It also uses the threaded spider. If for some reason someone runs across the splined spider or some 3/4 shoes I want them.
The part number for the 2000 clutch is 58546-2. This is the same part number as the 1050 clutch produced at the same time. Homelite was terrible at numbering and I have numerous 1050 IPL's that show other part numbers for the clutch. The final 1050's used a 3/4" shoe. I do believe the 1050 clutch will fit the 2000 now I wish I could find some for the 2100. I also wish I could find a 3100G saw.