Speedometer Gears....please Confirm

I have a friend in need of the correct speedo gears for his Dana 18 which is going into a 3.73 geared cj. Hours of research here has me 95% sure that I have the correct gears for him. Hoping someone can get me to a full 100% confidence level. Here's what I have:

6 tooth drive gear # S-W 447537
16 tooth driven gear # S-W 448856

They are a matched I removed from a 'case at some point. I know they will work together (mesh), just want to be sure they are for 3.73.

Thank you, you big bunch of JEEP monkeys.

 

Looks like winners to me.
Of course, tire size/diameter changes everything

 

Thanks. Yes, tire size would have an effect but, that's on him. I'm sure he realizes it. I'll mention it, though.

Hopefully I'll come across another set of these in the future as this is the only set I have for 3.73s. Hate to give up the last of my stock but, he's a good guy so.....