Confused about updateing to 10.5.5

[lgevo]

I have lawless 10.5.4 but i need to be 10.5.5. i have the asu 0.5. I was reading and ended up gettings really confused. do i need to have the voodoo kernal and what is the seatbelt.kext and do i need it... i need 10.5.5 for a program. it cant run on anything below. i dont need to go any higher then 5.5 just help getting to there would be great.


i got a ECS GeForce6100PM-M2 motherboard
with a AMD Phenom(tm) 9600 Quad-Core Processor