Thank you for your inquiry. The SK 184.03 number is a generic European number describing keg couplers/dispense heads in general. SK is a version of our UL (Underwriters Laboratory). I suggest you compare the coupler you have to the ones on this link:
http://www.micromatic.com/category.php?cid=20
Mike Godwin, Micro Matic USA, Inc. Northridge, CA