Hard to find and desireable parts

[JimmyFloyd]

What parts would you consider hard to find and desireable? Ie, parts that shouldn't be passed up when browsing through the junk yards? This could be small year range only parts, or rare factory/aftermarket options.

For example, i was going through a junkyard the other day and saw this 90 suburban with what looks like aftermarket mirrors, overhead and center console, and high back seats, but am not sure if any other that would be worth grabbing to help out fellow members.