Question About 8BA Truck Oil Pans

[leon bee]

I don't have a very big pile of stuff to look at near me. Wanting to do an F1 for my next project. Got most everything but the truck, have an 8BA, floor shift 3 speed and the bellhousing and starter plate. And the flywheel, too, I've mocked all this up. But I only have a car oil pan, won't know until later if this will fit down into the pickup.

Here's the question: I see the pictures of the truck pans, just what is that rear welded on bracket for? And why? Tried to steal a picture off ebay, but it wouldn't let me.