i have a noisy release bearing, can i replace just the bearing or does it mean clutch is on its way out, its on b16a delsol

 

might as well buy a whole clutch kit while your at it.. theres no reason to take the tranny out and not replace the other old parts
clutch kit - pressure plate, clutch disc, throwout bearing and the bearing for the flywheel
also= when you replace a clutch ALWAYS get your flywheel "turned" or resurfaced...if you dont have a shop nearby that offers this service buy a new flywheel.. adios