Sec. 60.02  Authorized disposition; youthful offender.
    When  a  person  is  to be sentenced upon a youthful offender
finding, the court must impose a sentence as follows:
    (1) If the sentence is to be imposed upon a youthful offender
finding which has been substituted for a conviction of an offense
other  than a felony, the court must impose a sentence authorized
for the offense for  which  the  youthful  offender  finding  was
substituted,  except  that  if  the youthful offender finding was
entered pursuant to paragraph (b) of subdivision one  of  section
720.20 of the criminal procedure law, the court must not impose a
definite or intermittent sentence of imprisonment with a term  of
more than six months; or
    (2) If the sentence is to be imposed upon a youthful offender
finding which has been  substituted  for  a  conviction  for  any
felony, the court must impose a sentence authorized to be imposed
upon a person convicted of a class E  felony  provided,  however,
that  the  court  must  not  impose  a  sentence  of  conditional
discharge or unconditional discharge  if  the  youthful  offender
finding  was  substituted for a conviction of a felony defined in
article two hundred twenty of this chapter.

(For verification consult Official Text at Senate Gopher site.)