Sorry ... don't know much about Hollywood bars. How high are they? Going 8-10 inches should be fine with no extension needed. Some creating bending/re-routing of the front-brakeline is required though.
They aren't high at all. Just more pull back on them. from what I've seen they are a bolt on for the 48. I can guess why the stealership says you need the cables. What I'm not sure on is if the cables on the 48 are longer than an iron. again sorry to hijack!