The 25mm version is compatible with 1 inch cable grommets as shown in the picture below as well as M25 cable glands.
But you can use the blank plate to remix your own version if you have different needs for your car 😄
The gasket is optional and does not exist with the original plate, however it can help to reduce water/dirt/noise ingress into the passenger compartment.
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The author marked this model as their own original creation.