Last years S2 didnt come with front dovetail, however you can buy a genuine part that fits over location pegs and also screwed down. Quite substantial, shocked me when tightened up.
S2 made from Jan this year will resort back to the inbuilt front dovetail as before.
S2 gold valves still need to be machined but when done offer a far superior firing cycle. The earlier valves which are the same as the 2002 from 1998 can be partially converted.
I have the second converted one in this country Sept 2005, still on original reg seals and untouched since first done. Power stable from -6 to 92 degrees then its only 4 ft/sec above that to 100 degrees.