The choice of handles is quite varied, I think even LL have their own handle-mod-kits, u`d have to check with the LL homepage and then prehaps see if ST can get them for u. - that`s if u want to go for the purpose-made ones.
Easiest thing in the world to screw handles through some pre-made holes - but the key is as Kemp says with the support for them, otherwize u`ll get them bending a little everytime they`re used, eventually bending the metal around the screws until they just bend right thru the alu.
There`s a modding genious on this forum who puts handles on his stuff, think it`s mark.. (don`t shout at me if it`s not >.< lol)