Those are Wipac Quadoptic Justin. I know that Guy Mayers uses those in his Hawk, but I don't know if Guy has X1/9/OE Stratos headlamp nests now?
I've definitely fitted Cibie H4 7" headlamp units to the OE Stratos headlamp nests.
You can still find the RHD version of the LHD OE Stratos Carello 7" headlamp units, if you're very patient. I've got some.
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