FYI, I've been told by ECR (East Coast Rover) that the D90 A/C units work better that the original D110's, but I know you'll pay. Also, you may want to contact ROVERLAND in Martinez (they supply OEM's) , used parts and won't ripe your eyeballs out!!!
When I was rebuilding mine, George, at Rovers Down South found one for me ($1800, ouch) but ultimately, I replace the entire bulkhead and dash with the 90 style, got my vents back and love the 90 dash, with parcel shelf much more.
The NAS was not the only one to use that AC, many 110s that went to the continent also use it., As a heater, it's equally inefficient, too