YES they will bolt right in.
It is up in the driver's side frame rail behind the cab. You will have to slide up under the truck to see it.
The location of the jack, lug wrench and other tools for changing a tire on the Chevy Silverado depends on the model and cab style. For example, in a 4 wheel-drive extended cab (2002-2007) they are located under the rear bench on the passenger side. They are held in place by brackets attached to the floor. The arrangement is similar for other cab styles but the position on the rear floor may be different.
Yes
Need to know which year, and whether you have the quad or extended cab. In the quad cab and extended cab models, it's usually under the rear seat. For the standard cab, it depends on what year you have. On my 87, it's actually in the engine compartment. On more recent models, it'll probably be under the bench seat.
no
35
The jack is located under the rear passenger side seat. The tool kit is located behind the rear drivers side seat.
"Where is the oil plug located for a 2008 Chevy silverado ext cab?"
In the extended cab, it is located behind the jump seat on the passenger's side.
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4L60E automatic.