Firewall A/c Hole Plug
1967 Ford Mustang (Coupe)
May 3, 2026
Use the built-in measurement tool to verify fit before downloading or ordering.
Description
This is a plug for the oval A/C hole in the firewall on early model Mustangs. I made it for a '67 coupe, but it looks like it should work on earlier years also. PLA was too rigid, but [Nylon-230](https://www.amazon.com/Taulman-Nylon-230-Printing-Filament/dp/B00WTNL2KI) worked well.
Print Instructions
Standard FDM printing settings: - Layer height: 0.2mm - Infill: 70% - Supports: As needed
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Use the built-in measurement tool to verify fit before downloading or ordering.
Part Description
This is a plug for the oval A/C hole in the firewall on early model Mustangs. I made it for a '67 coupe, but it looks like it should work on earlier years also. PLA was too rigid, but [Nylon-230](https://www.amazon.com/Taulman-Nylon-230-Printing-Filament/dp/B00WTNL2KI) worked well.
Print Instructions
Standard FDM printing settings: - Layer height: 0.2mm - Infill: 70% - Supports: As needed