Technical Red's Headers Ford Flathead Info

Sorry for such a basic question, but always get great answers here.
I am needing the outside dia. of the Red's Headers that I am using on my '49 Coupe build. I put a '53 engine in it that already has the headers installed.
I had looked up info the the Red's headers, and the Internet says 2 1/2", so never thought much about it.
Well now I am soon getting ready for some exhaust, and realize that the outlet dia. is no where close to 2 1/2". Much smaller.
Due to my somewhat handicap status, I am unable to crawl under my car, or bend down thru the top to measure them...
Soooooooooooooo sorry for the long dissertation..
What is the end OD dia. of the them ??
Thanks Much.

 

Don’t forget, that the header end will go inside exhaust pipe .

 

Probably best to call Red’s.

 

Thanks again for the replies..
Kept getting recordings at Red's, so kept digging.
Finally found the info. Flathead Ford's have a 1 3/4" OD on the end of the header.
Maybe this can help others too.