Salvage yard is your best choice.
A Chevrolet spares dealer.
E-bay
You should just buy a replacement panel rather than a whole new garage door if you have a cracked top panel of the garage door. Remember to buy the same panel as a replacement panel or the door might not function correctly.
You can purchase replacement parts of a garage door at Home Depot in person, or online at www.homedepot.com.
Yes, you can buy a replacement remote from your manufacturer (check your manual for details), and if they don't offer that, you can get a universal remote online and use that.
No
i highly doubt it but there is a possibility
Wal-Mart
Salvage yard?
A commercial glass door would be purchased from a window replacement, or window repair compnay. Where to buy depends on where you live, and where there are local companies near you.
you buy a chevy
Looking at the manufacturer of the garage door and requesting replacement parts would be the best solution. Also looking for the springs in a auto parts shop would suffice.