those were the best pics i could take at the time as the engine was in the car..let me see if i can dig up any other pics. When I got the turbos originally they were GMS600s. I know they are ball barring 5bolts. I just found some of the older pics. Sorry guys, as i mention i had a minor concussion yesterday and i can't sleep and i'm on drugs but i guess thats no excuse thanks for the help. here are the pics