This is in fact the case. ARB does still offer the side rails/steps (ARB# 4410010) however they will only work with their older bumper which is no longer available in the US and Aussie. If you were able to track down one of the old style bars (most likely going to be used as they have been discontinued for 4-5 years) we could get you the side rails/steps to match. Unfortunately their current sliders/steps (ARB# 4410020) are that only (steps/sliders) and their new front bumper (ARB# 3410100) won't accept the older side rails. The easiest option for those with new style bumpers (often called the Dakar) would likely be to have a set of side rails made by a local fab shop to match your sliders and bumper, it shouldn't be a complicated job and would result in a near identical look to the older ARB offering imo.
Hope that helps!