Driveshaft swap trouble

I just recieved my ACPT carbon fiber driveshaft and I tried intalling it today.. I have come to a problem though. The driveshaft is supposed to eliminate the 3pc into a 2pc, however, the last part of the CF driveshaft has 4 bolts to go into the existing last section while the stock is 6 bolts. The connections do not align correctly..is ther an adaptor i must need or am i just plain dumb?