Zipper size

[Aviador]

Hi guys, new here.
I’m restoring a lw Foster MIL-7823(AER) jacket …knits and hem are already received from Japan waiting to send to a professional taylor among the zipper which was changed for a Talon that looks to be size 8 , I found a Commar Size #5 on eBay but it looks small to me. My question is .Is that the correct size for that Jacket?
Thanks.
Really nice forum.
Chers ,Frank.

 

[Shanghai-Mayne]

suppose be size 5 zip. But I am not expert on USN jacket.

 

[coolhandluke]

suppose be size 5 zip. But I am not expert on USN jacket.

+1...blackened brass No 5 Conmar like the one shown below.