i think that ffs022 is an alloy single speed hub and wont work...

G84302 is the kit u want - pic is here http://www.cenracing.com/accessory.html#upgrade right at the bottom of the page.

man theyve messed that website up... sigh...

not sure if the links below are to a reputable company - try emailing or ringing first - i remember bad reports

G84302-04 is the 1st gear hub http://www.zertuchegroup.com/parts/r..._G84302-04.htm

G84302-02 is the 2nd gear hub http://www.zertuchegroup.com/parts/r..._G84302-02.htm

GS087 and GS088 are the genesis 43 and 39T spurs - like i say tho u will need the bearing to go with the 2nd gear hub, its the same as the big diff bearings - 10x15x4mm, the first gear hub has the 1 way bearing already installed.

HLHTH