I would have thought the EK4 one would fit perfect, I done a 5 lug conversion on my old EK4 with trailing arms from a DC2 which effectively has EK9 brakes and the cable was perfectly fine.
Or where abouts are you experiencing fitment issues?
Sorry to bump this thread back up but it wouldn't let me PM the user.
Could you clarify, did you use the EK4 handbrake cable or DC2R cables when you did the 5 lug conversion?