I installed a 2021 angle drive into a GEN 1 2019 car last night using the 2021 drive shaft and belt and it is direct replacement. Speed matched perfect did not get a MIL on the dash. the 2020+ angle drives had a complete overhaul on the design bigger casting with more ribs. I wish I would have noticed this 1 year ago. Seems Polaris intends to use these parts in the future to replace old units once they burn through the previous generations. The 2020+ has 1" larger ring and the ratio is 2.8:1 with a 35T output sprocket the previous 2015-2019 was 2.25 to 1 with 39T output sprocket. The sprocket change is what makes up for the difference in the drive ratio and is why you will need to run the shorter belt if you convert. Parts needed. 727-809-3256 is the best way to get ahold of me.
2020+ drive shaft
2020+ angle drive
2020+ belt