Did I make a wrong choice in trans cooler ?

[blazer2007]

I put in a new rad and decided to get rid of the old ugly one for a bolt on Hayden , but it looks small once I got it on. It looked thicker in the picture. Says is for mid size van.which I did not see until the box came. I don,t tow anything , truck just runs around a small town ,hardly ever on he hiway .Truck is a 78 chev short box stock 350/350. Cooler is not connected to the rad. The old one worked fine for years. What do you think. Here is a pic of old one and new one.https://www.summitracing.com/parts/hda-676