You can download the 250 hours on type directive from the DGCA website from here.
.:: Directorate General Of Civil Aviation | Ministry Of Transportation Republic Of Indonesia ::.
Look for AU.403/1/1/DJPU.DKUPPU 2013 at the bottom of the list. It's written in bahasa and is lacking in detail, but has a list of operators that it has been sent to in the bottom and includes both part 121 and part 135 operators (including Susi Air).
Don't know whether there's been any further updates after this, but the original directive does not make any mention on the size of the aircraft o the number of seats that this rule applies to.