there are nuts 7235969 that go behind the knobs to hold the radio in the dash also two bolts with spacers at the bottom i attached clips from the radio installation manual
the top special spacers 7255934 and bottom spacers 7256466 are available to buy online from a few places rubber washer 7253485 is not special, it just keeps the bolt in place while you hold the radio so that you don't need 3 hands to install
don't forget felt washer 7242365, you can cut that out of felt or leather, it's to keep dust out of the control shaft and make a nice cushion for the knob
