They have a listing of all the auto salvage yards within the US which have them in stock. You might be able to find a place local to you.
If you're in the SoCal area, you can try these places** - They carry parts for Japanese vehicles & trucks
California Auto Wrecking - 9365 Glenoaks Blvd., Sun Valley, CA 91352 - (818)768-7604
Auto Recycling of Wilminton - 418 E. Anaheim St., Wilmington, CA 90744 - (310)834-7583
Japanese Truck Dismantling - 940 N. Alameda St., Wilmington, CA 90744 - (310)835-3100
**I have no affiliation with these places - these are just recommendations...