Bill,
you are more than welcome. I had been looking on the Grainger site and they have 1/8" acrylic strips, 60" and 48" available in pairs. Could be another solution.
OH...if the bed is riding a bit LOW on the swinging arms it will be very difficult to push in the last few inches. Adding an additional washer/spacer MAY free that up for you. Anyway...more food for thought! Thanks again!