The Supertech dual valve spring kit for Hyundai 2.0L Turbo Theta L4 engines is specified for that turbo Theta 2.0L application and includes the note to use OEM seal-seat. The description explicitly ties the kit to Hyundai 2.0L Turbo Theta L4 engines and the OEM seal-seat instruction. This kit is intended for valve spring replacement or head service where the OEM seal-seat is used on those Hyundai engines.
Supertech Hyundai 2.0L Turbo Theta L4 Dual Valve Spring Kit (Use OEM Seal-Seat)