A roller leveler assembly has a first cassette having a first set of work rolls of a first diameter and work roll spacing and a second cassette having a second set of work rolls of a second diameter and work roll spacing. A drive mechanism selectively drives one of the first cassette of the first set of rolls and the second cassette of the second set of rolls. The drive mechanism has a first set of upper drive shafts and a second set of lower drive shafts and a drive shaft support assembly. The drive shaft support assembly has a first support shaft for supporting the first set of upper drive shafts and a second support shaft for supporting the second set of lower drive shafts. The first support shaft and second support shaft each has a first set of saddles and a second set of saddles for supporting the first set of upper drive shafts and the second set of lower drive shafts in first and second positions corresponding to the work roll center spacing of the first set of work rolls and the second set of work rolls, respectively.