If you are looking for just a solenoid valve, get one from any factory turbo car.....one notible unit is a 1988 Pontiac Grand Am turbo.... 2.0 turbo i had one that tought me everthing about turbos.

or a 86 transam turbo 4.9
sunbird turbo

GM stuff is used by alot of the stand alone ecu companies so thats why is use them....i've had my TEC II on 3 cars with 6 different setups.