I sourced a couple of these vents on eBay some years ago. I don't know what they came from originally. I was surprised that they arrived with clips to hold them in the trim piece. I'm not sure if Lotus ever bothered to fit the clips, for some reason I think not.
I must get around to fitting the vents to my Elan sometime. The previous owner, who restored the car, fitted new pillar trims without them. And they were not in the box of parts that came with the car.
Has anybody ever drilled the 1 1/4" holes while the pillar trims are in situ? It seems like a fraught exercise, and there would be no chance of fitting the clips....
Nick