Under Dash Vent E-Type SII

[andfay]

Hi,
I am missing one of the diffusers which clip onto the fitting under the dash, each side, which has the vanes controlling air to the footwell.
I just need the clip on diffuser but they appear to be unavailable.
I thought I might try to 3D print one and just wondered if anyone has a CAD file before I start from scratch.