Here is the situation.

All the builtin drawers in my house (Kitchen, bathroom vanities) are the same kind, these monorail center tracks with a bracket screwed to the back of the drawer, and a wheel that rides the track above. They are basically these at HD.

The house was built in 1965, so they are cranky and fussy and noisy and bent.

I know I can replace them with these newer versions at HD, but we were hoping for something smoother with that slow shutting feature all the cool kids have in their houses.

The cabinets themselves have a face frame, and I mention this because it means I have very little space between the side of the drawers and the face frame (like a quarter inch or less).

I have explored replacing them with different side mounted or undermount options. I would be willing to notch out the cabinet face a half inch on either side for the side mounts, BUT they are still a problem because the interior of the frame doesn't allow for a half inch of extra space for any side rails.

As far as undermounts, I did try replacing one of them with something like this, but they really don't take the weight very well.

I was considering these undermounts but they would still require some sort of notching on the bottom corners to clear the support rail, they seem to have very limited options for length (which would require a lot of finessing and adding support blocks, etc.), and at $34 a piece for 20 drawers, adds up pretty quick.

I'm ready to give up on the slow close dream and just replace them with newer versions of what they have now, but I was hoping someone here might have a brilliant suggestion.

Hope I described it all well enough. Many thanks.