The M1A1 interior set is kit #621 and designed for use with the Academy kit, which means it can be used with the Tamiya kit. Includes many exterior parts like the CLAMS, back deck hatches, bustle rack, and machine guns.
It was not designed for the straight M1, but most items could be used on an M1 (not bustle rack), or M1IP (not access hatches). The lack of a breech has been the major complaint as is the lack of the turret basket.