First, you will need to make sure that the bolt pattern on the 2007 rims matches the bolt pattern on the 2000 Silverado. If the bolt patterns do not match, you will need to purchase an adapter or have the rims redrilled.
Second, you will need to make sure that the tires on the 2007 rims are the same size as the tires that were originally installed on the 2000 Silverado. If the tires are not the same size, your speedometer may read incorrectly.
Third, you may need to make some modifications to the suspension of your 2000 Silverado in order to fit the 17-inch rims. This may include installing new springs or shocks.
Finally, you should be aware that installing 17-inch rims on your 2000 Silverado may affect the handling and performance of the vehicle. If you are not comfortable making these modifications yourself, you should take your vehicle to a qualified mechanic to have the work done.