I have a RK Custom seat on my 06 standard,very happy with it over the last 40,000 miles.

 

Is there a difference between a
Road King custom and a Standard Road King w/ the seat? I think I see the extention coming out the front of the seat of DANSFLHTI, right? I take it w/ the RK i'd need an extension. Is there anything that wouldn't need the extension other than the factory seat or another Ultra? The seat securing properly is a priority but the finished look is pretty important too.