Hooker Blackheart has quickly become the leader in LS engine swaps and we are excited to offer this adapter bracket, which provides for installation of a 4Lansmission in multiple applications using Hooker Blackheart transmission crossmembers. This adapter is validated for use with the Hooker Blackheart 12616HKR crossmember for 1970-1981 GM F-bodies, the 71222016HKR crossmember for 1979-1993 Ford Mustangs and the 71222013HKR crossmember for 1994-2004 Ford Mustangs.