There isn't one for the S15. However, the S14 kit is:
14401-69F28 Turbocharger Gasket Kit
14495-17F00 Plate-Lock
14036-75F00 Gasket Exhaust
The last one is the mani gasket.
You may find that the oil outlet gasket doesn't fit. If you want one, its:
15196-69F00 Turbocharger Oil Outlet Gasket