Hole in Firewall for Clutch Linkage

[ACK]

For those with an automatic in your truck, how was the hole in the firewall where the clutch linkage goes through filled? I'm looking for a solution that doesn't involve welding and can't located a grommet with a 1-7/8 inner diameter. I'm leaning towards cutting an over-sized sheet metal circle, adding a ribbon of insulation, and screwing in place, but would like a prettier solution.