In your pictures the shape of the side straps are not even close to the same shape as a Modine/San Jose style and neither is the shape of the side strap design. San Jose dud have flanges on bot sides during 65-66 for Mustang application
One in your picture the straps are some what pointed then round unlike this example
And here are a couple of pictures of the side strap design. Dearborn and NJ were similar in this way. Unlike the style your pictures show with flanges on both sides of the straps