Originally Posted by firehawkmph
I don't think you guys are on the same page. I believe he's talking about the outside of the 12" deep cabinet door hitting the side of the 15" cabinet it is mounted next to. The cushions you show are made to go on the inside. I haven't seen anything that restricts the swing of the door from the inside. That's one of the pitfalls of staggering cabinet depths on the uppers. Designers love to spec 'em, but they never have to hang 'em.
I think the guys were suggesting sticking such bumpers on the edge of the face frame of the deeper cabinet; I have used the little clear dome shaped ones for this and they mentally fade away as a visual issue in short time. Locate it high so that the upper rail of the cabinet door will contact it. As stated, certainly not the most elegant, but functional to prevent damage in the short run.
For permanent mehanical limit, I have had success in the past with one of the arms that are designed to limit travel on toy chest or cedar chest lids. For starters look at the selection of lid stops at the HD and Lowes. Rockler and other on line hardware suppliers also have a selection on line, but it is best IMO to be able to position the piece physically in the air as you try to visualize whether or not the particular mounting configuration will work.
The small brass chain also works, but instead of cup hooks, I fastened it to the bottom edge of the upper face frame rail, and then into the door stile with brass screws.