Re: Quicksilver controls
You have brand new control, no reason to replace it. Like I said before, get the standard 33C cables with theads on each end. Like this.
Then get Merc adapters for the control ends, and Johnson adapters (I posted the link earlier) for the other end. (should you get a Johnson) if you get a Yamaha, the cable has the correct end
The controls themselves can change inside if you need to change direction of shift or throttle from what Merc was.
Trim wiring may have different colors, but not a problem, they still have the same type system.
I have a brand new set of old style Quicksilver (Top Mount) Controls recently installed on my rebuild project.
There many different "Old styles" of top mount controls, post a picture of what you have, I have the manual to show how to hook the cables up for the direction you need.