You'll have a KO3s already on it unless its already been changed. These are good for 240ish I believe, you could have yours rebuilt and Hybridised with a KO4 cold side. I think it's Littco on here that can do them.
Think that's the way Ill go when mine dies as they can be good for 270+ by which time you'd need rods etc to go higher so it all gets expensive.
I think the Hybrid is a straight swap too unless the Tip needs to be a KO4 specific item.