Dartin for Divorce

For brake lines I'm a little confused if I need to replace them or not. I mean my brakes work well right now. Rock Auto has what seems like all the brake lines for a 88 diplomat on clearance/closeout right now. Or does the Dr Diff brake line kit have everything I would need to replace?
are you talking about hoses or hard lines? if the car was from back east, salty and rusted, you'd probably need to do the hard lines at some point, but south west car probably never. the hoses i change as a routine wear item unless i know they were done in the last 10 years