dart swinger fender brackets- interchangability??

Im looking to buy some fender braces from a member here (the ones that mount from just in front of the front tire on the fender to the frame) but I just wanted to verify that these brackets were interchangable between a 71 and a 73 dart or duster before I bought them (already have them lined up). He said they were 12" long and about 3/4" wide. Can anybody verify this on their own 1973 (or similar vintage) swinger?
Also, does anybody have any pictures of these brackets on their car? I can't seem to find any online.
Thanks all for viewing. I appreciate it.

-Mike