the sp forks, which are fully adjustable, should be 433mm http://i753.photobucket.com/albums/xx17 ... Pforks.jpg
the pdf's in the links also give the air gap at the top, although these measurements are for 5ft 6in japs who weigh 9 stone, so there a good starting place, but you may find you need a bit more, i put 510mm of 10 weight to start with and i'll top up if necessary, you could also try 15 weight oil as some do in their track bikes to stiffen things up a bit, just don't overfill em or you'll blow the seals out

i made a tool for getting the dampers out http://i753.photobucket.com/albums/xx17 ... C00027.jpg
as you can see i tried several different sizes and found 29mm did the trick inj the end