Who knows what those bolt holes might be used for in other applications. This motor was produced for various markets in different applications (left and right hand drive) for many, many years.
My 1998 XJ is on the lift right now and I just went out to look at it. I wish I could post pictures, but I can't. All of the bolt holes iyou have pictured go un-used with the exception of one. In your first photo, the bolt hole to the right of the bracket uses a wire holder. A loose wire clamp...
I know someone out there must have a stock cat converter kicking around in their garage. I need it to pass emissions here in Cali. Thanks.
Paul (707) 292-0810