I had no idea you can successfully fit the Amplilux in the housing of a Porsche 914 without modification to the headlamp metal covers.

Look at the relief-bump incorporated in this photo of the headlight covers of the Sonauto #121 factory GT https://pbase.com/9146gt/image/22244473 - Since I don't have a detail photo of the headlamps used by the Sonauto #121 car, I now wonder what it actually uses, an Amplilux, possibly CIBIE Biodes? Mmmm???