The Immigrant Ships Transcribers Guild has done an amazing job in locating lists from all over the world. Their site located at http://istg.rootsweb.com/index.1 is superb. It seems there are 28,000 lists for consultation. There are about 40 lists for Glasgow, and even an 1848 listing for for the island of South Uist, in Scotland. It seems that the database is searchable by surname; surely worth a try?