Thanx for the kudos. I presume you've read through this thread, but I didn't post every detail.
For example, I made cuts in one flange of the angle-iron cross-member of the mount to bend tabs away to clear the oil-cooler bolt heads. Otherwise, with the addition of the rubber-hose spacers, the oil cooler fit through the window just fine.
I had considered relocating the oil-cooler mounting to new holes I'd have to drill and tap in the flange of the mount itself, but what I did was much easier. It leaves the bike itself functionally intact, making fairing and mount removal easier later.
The '78 was the last year of the SOHC engine; a mount from a DOHC engine starting in '79 may be a better fit. As long as you have the mount and the bike in front of you, you can figure it out. My mount (and WJ5) came from an '82 750 K.