Congratulations on your Domani. We really enjoy ours. The large slide runs on steel rollers that are supported by the frame brackets. They look to be about 1.17" diameter by 4.125" long. They appear to be held in place by a shaft as there are cotter pins on each side. Where to find replacements? My guess is the slide construction is the same as the Cameo which were produced in larger quantities. Could be the Cameo owners could give you suggestions for parts. If no luck, it looks like it would be fairly easy to have it fabricated. I can give you the exact dimensions if you decide that route.