Carlon makes floor boxes. But the current size (for the last 7-8 years or so) has a 4" ID on the PVC box. My PVC has a 3.5" diamter. Emco (local distributor for Carlon) says they have not made the old size for a long time and have no suggestions for where to find one. I have checked every local electrical supply store in town. Still no luck. Any other ideas?