04 DTS has chrome wheels standard - you can check them if you have a dealer around you. 03 Deville had chrome wheels I believe it was upgrade from standard - too many spokes for me. check the size of your wheels and compare comparable sizes when looking; I believe DTS has 17' wheels stock. See also the line of ads above this reply box.
Check eBay. They always have OEM chrome rims on there. Personally I prefer the DTS rims. They are 17". I bought mine off of eBay since my DTS came with painted rims. I don't think chrome rims are standard on the DTS. It is very rare for someone not to order the chrome, but you see them once in a while (like on my car).