Hi. I have been looking around to source some spare light units for my car.The rear lights are also off a 60s Hillmam Minx or a Sunbeam Alpine and I purchased a pair of complete rear units from Michael Langley at
Hillman Rootes Sunbeam Humber Alpine. These were used with excellent chrome and very good original lenses. The side repeaters were NOS off Ebay UK and are also used on BMC Austin and Morris 1800. These came from seller ectronjack.The front Indicator/Sidelight units are also used on MG Midget and Sprite and were purcased new from an Ebay Uk seller.
Hope this helps.