17 inch diameter to clear the front calipers.
2012 Ram 1500 wheels will fit on a 2003 .
No.
1500-1500, yes
Yes
They should fit 2003-2016
If both 1500's yes.
No. Different pattern and offset.
2002 Ram 1500- no 2002 Ram 2500, or 3500- yes
YesYes
No
No it will not.
A 2009 Ram 20 inch wheel will fit on a 2000 Ram 1500 4wd, but not on a 2wd.