I forget the exact replacement size but for me with 4 scuppers as you probably have It made more sense to switch to ball scuppers. I also changed the brass tubes for good measure.
Tap it with a soft blow hammer and see if it moves in. Look inside to see if any hardware is missing or loose.
Sometimes It's just the way they are. When it's assembled it's not an exact science when they trim off the excess.
I did mine myself. Took plenty of time to lay it out. Figure 3 hours.
The thought of having someone else drill holes in my boat just doesnt sit well with me.
Welcome.
What's your boating experience?
What's the plan for the usage? Fishing? Pleasure? or both?
Trailering or wet slipping?
What features does the boat have now?
Pictures and current specs?