Check with your local GM/Chevy dealer. This could be a dealer only item, especially if there is a special 'chip' inside the key for identification and anti-theft purposes.
Dealership.
Assuming you lost the keys, write the vehicle identification number down on a piece of paper, take that and proof of ownership to your local Chevy dealer and they can reproduce new keys for you.
The EGR valve on your Astrovan is on the backside of the intake manifold just under the throttle body attached by two bolts. After installing a new gasket be sure and torque the BOLTS to 17-18ft lbs or the NUTS (if yours has studs) to 15ft lbs)
Order some new ones or change the locks.
V-R- Troopers - 1994 New World Order 2-71 was released on: USA: October 1995
Get the key number from a key barrel and order new ones through the maker.
You can order it online for about $110.00.
The Secret World of Alex Mack - 1994 New World Order 3-8 was released on: USA: 29 October 1996
a new order of consciousness
New York Alicia Keys lyrics
1-2-3-4-5-6
Alicia Keys was born in New York City, so yes, she is an American.