Do they exist I can't find any.
What I have is a 6 way light fitting that takes the GU10 halogen fitting bu lds. I brought a couple of packs of GU10 LEDs from B&Q speacial offer was £12 for 2 now £8 for 2 345 lumen dimmable LEDs by daill
But they don;t quite fit in the front room they need to be about 3mm longer pins . So what I want is an extender not an adapter which keep coming up. I'm quite pleased with them in the kitchen where in 4 way light.
BTW I had to replace my previous (halogen) dimmer as it wasn't right for th e LEDs they flickered at low brightness and didn;t vary much in brightess.
Looking into this I found that I needed a particualar type of dimmer and th at being a falling edge triggered dimmer and that works much better.
So time to do the same in the frontroom... but the LEDS wont quite engaged the holders.