HelloCustomer The reason for the modification on one side versus replacing is due to the rotation. GM doesn't make an updated starwheel for the passenger side. As far as the cost, it's excessive. I've done these before. You can do this yourself if you have the ability to grind. I am going to include the bulletin for this with illustrations. You need a left self adjuster, you'll need to resurface your drums and you'll need to grind off every other tool of the right self adjuster. If you do this yourself, it will cost you a tiny fraction of that cost.
Your JA Expert,
Bulletin No.: 07-05-24-001B
Date: February 25, 2008
This bulletin is being updated to add model years and additional information. Please discard Corporate Bulletin Number 07-05-24-001A (Section 05 - Brakes).
Some customers may comment that after the vehicle has set for a while, during the first few stops, it will feel like the brakes are grabbing excessively. In addition, the tires may chirp and/or leave skid marks during braking.
This condition may be caused by a mirror-like finish between the drum and the brake shoe.
Remove the rear drums and inspect the rear axle seals and wheel cylinders for leaks. Inspect the brake shoes for contamination. If no leaks are found, perform the following:
For vehicles repaired under warranty, use the table.