Cee5Go

Fellas should I go with the slave and clutch kit from GM or go with aftermarket slave and kit. If aftermarket any recommendations and where to buy.

1999 vette unmolested(no mods) with normal driving.

oh yeah. Clutch master cylinder almost empty and fluid is leaking from bellhousing slighty to the right side of the car. (passseger side)

bumble-z

You will have many trouble free miles, going with the stock GM parts.
Replace the clutch, pressure plate, fly wheel, pilot bearing, slave with throw out bearing, clutch master cylinder.

cdkcorvette7

LS6 or LS7 clutch kits will be fine for your stock vette. I agree with everything bumble-z said on replacement parts except the master cylinder. If it's not bad there's no need to replace it preventatively as the drivetrain does not have to come out to access it as is the case for all the other components. If you do elect to replace it I'd highly recommend a tick master cylinder over the stock one. I would also suggest you look into adding a remote bleeder line off the slave.

You should also inspect your torque tube bushings while everything is apart. They are known to deteriorate and if they're on their way out you may as well replace them too instead of going through all the labor twice.