I really should know all this stuff by know or at least write it down. The Badbird II is imminent and I need to double check some things. 60's Thunderbirds used 5/16 24 SAE I believe. The newer Gibson and Epi's use M8 (again I believe correct me it I am wrong !) When did Gibson change from SAE to metric? Are post '87 Birds all mertic? or did they change over in 2,000 something? I suppose I could price the bridge out with two sets of studs. Thanks guys!