The VS-3050 does not have the SVRS. This is the way I would show it:

011012 IntelliFlo VF => IntelliFloŽ VF High Performance Pump
011013 IntelliFlo VS-3050 => IntelliFloŽ Variable Speed Pumps - Old Version
011017 IntelliFlo VS SVRS => IntelliFloŽ VS+SVRS Variable Speed Pumps
011018 IntelliFlo Variable Speed Pump => IntelliFloŽ Variable Speed Pump - New Version

P6E6VS4H-209L IntelliPro Variable Speed Pump => IntelliProŽ Variable Speed Pump - New Version
P6E6Y4H-209L IntelliPro VS-3050 => IntelliProŽ Variable Speed Pump - Old Version
P6E6XS4H-209L IntelliPro VS SVRS => IntelliProŽ VS+SVRS Variable Speed Pump

The old VS-3050s are not shown on the Pentair web site anymore but you can still buy it in some locations although since the new VS costs the same, I don't think anyone should go that route.