That is possible, but it's a study in itself and you need some hardware.
# toploader pottery kiln with controller that can do a cooling path (important)
# supply of modellers plaster and fine quartz sand
# some mould making ability, all info can be found on the net.
# patience.
casting glass available here : https://glasscolor.com/catalog/product/view/id/17373/s/gaffer-orange-red/category/405/
After you manage to cast the part you need grinding and polishing equipment.
so....for the specialist :grimacing: .
better to buy 2 component colorised clear casting from Smooth-On like at this shop :https://www.formx.eu/molding--casting/index.php
more info : https://www.formx.nl/products/pu-harsen/pu-clear-resins/crystal-clear-200----1kg.php
but the easy route can be to opt for a existing clear lens and color it red !
have fun ! succes.
Barry I can't find a pic of the actual internals. But if the link to the Ariel conversion still works, it explains the procedure. The mounting foot is made shorter to accommodate the number plate window, so the bulb holder will have to follow suit. Ron
Barry you should have looked at that Ariel article like I suggested. Here's the picture of an original and the cut down version. Further down the list of pictures and there's a pic of it fitted. Ron