BG331017164 no

BG331017164 nothey aren't

BG331017164 yesthere is an 2U key an 1U key and other 2 that are like 2.25 and 2.75 or something similar

BG331017164 itwill work on nearly every mechanical switch, if on top of the switch there is a cross then it will teorically fit ifyou are not sure look on the keyboard manufacturer or the switch manufacturer if they uses the standard keycaps

BG331017164 nothe light can't pass trought it but it can pass in the middle of 2 key, if you want to use it without light you can't find the keys but it is the same problem in most keycaps set

BG331017164 yesit comes with a keycap puller, not great quality but there is