Yes,
I would go with rims that are close to the same size of the tires.
You can if they have the same mount lug pattern but why would you want to?
Yes tires and rims are correlated based on the size of the tires you are looking for. While you can interchange rims and tires as long as they are the same size you will need to ask your mechanic or repair service center if you have an unusual size rim.
yes with small rims,same sides yes with small rims,same sides
yes
The Rims will fit as long as they are the same number of studs and puting 17 inch rims on will not screw up your speedo as long as the tires you use have the same outside diamiter. If they are the tires that came with the original 2007 silverado they will be the same outside diamiter as your 16" wheels and tires You can also adjust for larger tires on the speedometer with a hypertech controller.
NO. As long as they all are the same size.
No the rims do not need to be replaced along with the new tires unless certain conditions require you to do so. The only time you need to replace the rims along with the tires are when you damage or lose them.
Only if the rims will fit over the brakes.Be very careful to check to weight capacity of the 13 inch tires to make sure it is enough.
no but you can put 15 inch rims on the car as long as the bolt pattern is the same
Generally most places which sell tires will be able to get you rims. The bigger chains such as Tire Kingdom, Sears Auto or Walmart will be able to accomidate you.
If the tires are the same size, they will but the rims won't.