An insert is provided for selectively filling a utility access opening in furniture where the access opening is formed in a panel in the furniture, but where the panel has a thickness that may be one of two different dimensions. The insert includes a sleeve having a stop for engaging a first surface on the panel, short retainers configured to frictionally engage an opposing surface in opposition to the stop when the panel defines a first relatively thin dimension, and long retainers configured to frictionally engage the opposing surface in opposition to the stop when the panel defines a second relatively thick dimension. A port mateably frictionally engages the insert to close the sleeve. The port is frictionally held in the sleeve by detents, and engages the retainers to hold them securely in engagement with the panel. The short retainers can be broken off so that they do not interfere with positioning the port into the sleeve when the sleeve is engaged with a relatively thick panel. A method includes breaking off the short retainers and engaging the insert with the relatively thick panel, and thereafter inserting the port into the sleeve.