Passenger Wing Mirror Blank

Hope someone can help out. I'm removing the passenger mirror from the car to save weight (yes it's getting that anal), but I don't want to make up a blank. I would ideally like to find the blanking plate that was available on Mk2 Polo's.

You can see the parts marked as no.12 in the diagram.

This way I can lose the weight and still be within the rules for the class as the exterior will be 'standard.'

I know it's a massive long shot and it'll prob. be easier to make one up...hell the Mk2 one might not even fit. But it'd be nice to try and get an example for proof.

Any help, greatly appreciated!