Weatherhead and Kelsey-Hayes?

Good Evening Everyone!
I need to rebuild our proportioning valve from our 74 Dart Custom brake system. Can you tell which valve you have from the shape of the body? I noticed from the photos here :
1970 - 1976 Mopar Combination Brake Valve Seal Kit | Muscle Car Research LLC

the Weatherhead has a deeper cut on the left side verse the Kelsey-Hayes. I believe I have a Weatherhead but wanted to be sure before buying the kit. I don't know if I can get in there to try and find the stamp as suggested by the seller.

Thank you,
Matt