Extra speednut in dash??

[Corvette95]

Yes, GOLDCYLON is correct. That is for right tunnel panel. Back to your post...there is a push in metal tab on the radio bezel in that area that either, get loose and comes off, or gets bent in and looses tension or just plain breaks. My rattle solutions for that is butyl tape (the thick stuff for windshield replacement), Get a good THICK brand and put a nickel size ball of it there (or anywhere that has a small rattle like you are mentioning (mine had it too). Is never hardens, stays sticky (ie vibration resistant), Cures a lot of rattles. Every C4 I have had gets a week one interior removal and I wrap harnesses control modules, just about everything with felt and velcro, the places the can't reach...the butyl tape comes out. It take a few months of driving and chasing the final noises out but well worth the time. BTW...probably too late, but Gordon Killebrew showed me a shortcut to remove the LTPWS module, cut the plastic divider behind the DIC and you can pull it out without any more r/i . I have never had to do it but it can be done.