roberthenry, i found out through
http://www.gmpartsdirect.com that your 1997 Buick Riveria has the part number 25678792. GM assigns a particular part number that can work for different GM models. As long as the part number of the remote matches with your car, then it will work. If you call your local GM dealership, they should come up with the same part number i found out through the above website. On their website they are selling it brand new for $42.37. Now, on ebay i found a remote with item number 1808795183, currrently selling for $20.00 as of Sat. Mar 2 2:55 EST. Make sure u put in a search under ITEM NUMBER in ebay to find this particular remote. It should work fine on your car. I have bought remotes through ebay for my car and have had no problems with them, including a bargain in price versus
www.gmpartsdirect.com and local gm dealership.