Thanks for the responses. Just to be clear I have already mounted Accuride 1029 bearing slides directly on top of the existing wood slide rails. They fit nicely but lift up the drawer box about 1/16", so support is needed on each side to prevent rocking.
I have also changed the drawer front from an overlay style to a flush style. I'd rather not put anything visible in the gap between the face frame and the drawer front, since it would look bad. The pictured guide rollers are made by prime-line and slide-co. Their rollers have tabs/cleats that would be visible in this gap.
Unless there are other roller styles available I will need to mount some slide blocks to the back of the face-frame with some dark colored wood or plastic. As long as they are set behind the 3/4" face frame, they should not be that visible. There has got to be something like this available.