Alright, the 20 spokes were only 2000-2001, but you can get any bonneville from 1987-2005 and put those wheels on it, but I understand thats not your intention.
There weren't THAT many options in an SSEi. Only about 4 (IIRC) make it a fully loaded car, these include heated seats, a cd-changer, and theres a few more I think. Your best bet would be to get any 00-03 SSEi with the other options (found best just by looking in your local area or looking through autotrader, no substantially easy way.) and then find some 20 spokes as they didn't come on THAT many cars. But you should explore what I currently have in the photo catalog...see what you like in there and then make your final decision on your favorite.