Never seen fast rope attachments on am MH-6J. The MH-6J version is with troop planks on the sides to carry 4 Operators or Rangers on. It is not really practical for fastrope insertion, without the planks, you can only carry 2 guys in the back, not including gear. It would get quite cramped.
Here is my 1/35 Dragon MH-6J.
http://www.hkngallery.org.uk/hkngallery.nsf/9e7858703c56bfb280256b960044cd7b/a7fdb4775cbc299480256f5300655119!OpenDocument
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
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"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell