I think if I was gonna make my own I'd bolt a set of late model spool mounts to the block, use the trans mount to locate the assembly fore and aft and make a U shaped adapter to bolt the spool mounts to the K member, or cut off the existing mount stands and weld the U shaped adapters tot eh K member.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.