Got rid of some annoying rattles.
The wheel chocks, jack handles, and lug wrench were rattling around under the back seat because I didn't have the pieces to put them away properly.
This diagram shows the jack and associated parts that are close to what I have in my T800. The extended cabs don't have the plastic cover. I assume this is because the seat hides them fairly well.
The chocks are bolted to the jack with #13 a J shaped bolt that hooks around the jack. This part was missing from my truck and GM discontinued it. However. 15783357 is the threaded J-hook that does the same job on the GMT900 trucks and as it happens it is plenty good enough for this job even tho GM claims it doesn't fit.
The plastic wingnut, #12, to hold the J shaped bolt over the jack was screwed down over one of the jack bracket studs.
I liberated the J shaped bolt from a 2012 wreck for $2, clamped the chocks over the jack, hooked the holes in the base of the jack over the hooks in the floor bracket, and extended the ram to lock it all in place.
The vinyl bag for the jack rods and lug wrench was among the missing as well but all three rods (#7 & #8) and the lug wrench #5 were present and accounted for... rolling around under the back seat against the wheel chocks. The T800 doesn't have #6.
The sheet metal retainer with the captive plastic wingnut for the tool bag, #3, was hooked over one of the plastic seatbelt guards that you can see in the below picture
The rods move around without the bag even when you bolt em down with the retainer.
The bag is discontinued but I found a brand new GM bag for $18. GM 15270258 for 2nd design extended cab GMT800. I was thinking about just sewing up a bag out of denim pantlegs and calling it good but the real thing looks better and it takes less time than sewing four tubes for the jack rods and the lug wrench.
These parts are likely to stay there after I swap the carpet this summer til after I get rid of the truck and never move again. The OEM jack and tools are flimsy enough that I figure they're for emergency use only.
I'm not real keen on the spare tire arrangement. It's under there and the cable is greased. Hopefully it moves if I need it.
The Jumper cables, mini floor jack, breaker bar with 6pt 19mm socket, snatch straps, swivel rings, and tire chains are already in their own separate waxed canvas bags so... no more rattles.