I put in a rear bench seat to make it safe for little kids in car seats, so I don't worry about the rear step. But I think this setup allows for a foothold. Don't be wearing your bellbottom jeans, though.
I purchased a new, OEM bumper from Toyota last year. Shipped to a local dealer. License plate bracket holes on the Passenger Side. Some extra holes but not nearly as many as what you have.
You linked a bumper that spanned ‘58-‘84 IIRC, that’s...