Help me with a toolbox for socket set

You guys are giving me some excellent advice. So I am interested in the steel tool box, maybe 20in wide. And maybe 2 drawers. My question is, these rails, how are they attached to the drawers? And do they stay put? I have the Harb Frey rails, as you can see, plastic and they sure are floppy and a PITA to get on/off. But this is obviously due to I can not attach them to the toolbox I have. help. sears has this Welcome to Sears.com
no drawers, but can I install those rails into it??

I am sorta limited on overall height as I stack this onto another tool box that I have, beneath my work bench. So I cant get the standard 3 drawer craftsman that everyone seems to own.