Grommets arrived from China, a good fit and they do slot around the inside recess ok, the blanking part is very thin so not sure how long it will last, I just cut a hole for the led to go through and sliced a bit of the edge for the lead to go back, thinking about it I should have cut the lead and made a small hole in the blanking part then re soldered, but I have a few more spare grommets so may do that at a later time.