Are the cables and brake lines the same for a Road King Classic and a Road King Custom? I have a spare set of RK Custom cables and would like to possibly use them with a set of beach bars. I'm hoping the Custom stuff is longer.

 

I don't know if they are the same, but I do know that I had to extent my stock cables by 4" when I put beach bars on my RK Classic (clutch by 2").
Hope this helps.

 

should be the same

 

I'm not sure either but I was able to use stock throttle and clutch cables on my RKC with my HD beach bars. I had to change out the front brake line though for longer.