My starter was for a 91, but any year 4.5 Allante should work.
Go to www.rockauto.com Use their automated catalog. Find Cadillac / 1991 / Allante / Electrical / Starter Motor. They have several choices. You can click on the image to see what it looks like. Way different from the stock 4.9.
[This message has been edited by Raydar (edited 04-14-2012).]
Also make sure your battery is of correct size....I had a 88 GMC that was hard to start once it got hot. Figured it was the starter being it dragged when trying to start hot or did nothing so I changed it out. The issue got better but only stayed that way for about 2 weeks then back to the same issues. Shortly after I sold the truck to my buddy who saw the battery was to small for the truck and bought the correct size. Has not had an issue yet with the correct size battery...