Cab mount questions

[TheStug]

Hello,

 

I'm doing a new cab onto a 2012 extended cab 4x4 silverado. Getting pretty close to ready to put the cab on and I just noticed a couple things about the body mounts and hoped someone can answer them.

 

First question. First picture is with 6 upper mounts on the floor. Notice the very front/drivers side (closest to the brake master cylinder) has this plate on top of it that none of the other 4 (front and middle mounts) have? Is this correct or did a plate fall off and I didn't notice? I would think i would see an impression of it if that were the case but just making sure.

 

Second question. I think i might be missing one of the plastic "cones" you see lying next to one of the mounts in the second picture. Is there a PN for this or is it pretty much a package deal with the body mounts? Is this needed for ALL 6? I only have 5 in my possession right now (count them in the first picture)

 

Third question. Referring to the 2nd image again, if you look at the top one (these two are for the very back of the cab), there's a plastic "centralizer" deep in there. but It's not there on the other one. I cannot pull this out so I don't see how the hell it could have simply fallen out. Maybe the "cone" lying there goes in the other one with nothing in it? Can't really find any decent exploded diagrams for this.

 

Suppose i need to buy some junkyard mounts to get the missing parts, what years will work for a 2012? 2003 and up? or 2007 and up only?

 

Thanks