Following the success of the 50 series STS combine, John Deere replaced it with the 60 Series STS combine, which was face lifted around 2007, then followed by the 70 Series STS, which John Deere would build until they started the Single Letter Series lineup, like R series tractors and S series combines. The S600 series replaced the 70 series STS.
Various tire options, as well as tracks
Grain tank extension options
Multiple pipe lengths to match your header
Visual options like a GPS globe and interior clutter
Different chopper spreader design options
Number options for big operations
Credits:
FS19: SiiD/JHHG/ThundR
FS22: Diniz Farms/OS Farms