Obscure or aftermarket P/S pump bracket?

Hello all

I’m trying to find information on the power steering bracket shown below.
Pictured is a LA-318 with the odd bracket and I’ve been unable to find any other pictures of it on the Internet. I can only find the common multi-piece bracket that places the pump down lower.

I was wondering what applications this bracket was used for. Years? Van? Truck? AC/non-AC/Both? Aftermarket? Frankenstein?
I have a 1977 Dodge (W200) M800 with a later swapped in 360 with this bracket and I’m not sure why it has it and not the more common bracket.

Here is the link to the youtube video if you want to see different angles.

Thanks

edit: oh and proper belt routing if possible for this bracket