The VMS 20 stylus has long been discontinued. It wll cost you a pretty penny to replace. I decided to pull the trigger on this model (VMS 15) it fits my VMS series cartridge perfectly (although a tad tighter in fit). Be sure to choose the version of this stylus with the hour glass connection. Although this is a slight downgrade to the VMS 20, I am very happy with this replacement. Detailed top end, smooth bass response and fantastic soundstage. The tracking force will need to be set a tad higher than the VMS 20. VMS 15 TF should be between 1.5 - 2.0g.
If you're sitting on the fence hopefully this review will help you pull the trigger.
Note: I am using this on a Thorens TD 166 MKII turntable with TP63 tonearm