i'll save you the £14!
Don't bother i brought some they don't fit properly and if you do manage to get them on they will all fall out when you go over a bump. Total waste of money
i tried them in my uno and they r pants,a waste of 8 quid,u have to solder them into your own holders as the holders they come in only fit the digital clock.
Yes maybe so, BUT, someone on here has done it, they used shrink wrap over the led and simply squeezed the led into the relevant switch etc. Do a search on leds I think you will find it on here.