Today i just noticed my LSPV started leaking and i'm not sure what to do about it yet. I'm changed everything on this truck but that particular thing. So i'm not sure if you can buy it at parts stores or if you can fix the leak?

 

you can buy it from toyota, i think its $185 from them
but, you could probaly find one at a junk yard, or get it from someone on here

 

as far as I know, there isn't a rebuild kit for it (since it's operation is pretty critical to your vehicle's safety) so it's going to be either used, from wrecking yard, or new.
PM DeathCougar on the forums. He might be able to find one for you.