Ok...here was solution and it worked out great. I found 3/4" PVC electrical conduit pieces at my Lowes and cut them down to the width I needed.
Using my band saw, I cut about half of the length off of the bushing piece, and about 1/4" off of the end of a coupler.
I then made a cut in each so I could spread them open over the lines and insert into 3/4" holes in the end cap. On the back side, I spread the cut circles over the lines and glued in place with PVC cement.
I took a file and filed off the rough edges on the inside so the lines would have a smooth surface to run against, and here is the finished project: