Getting four long, flexible leads through a tiny slot, then through four tinier holes, is not a task for the impatient. It took me a while to work out a system for getting them installed without drama.
These are 2x5x5mm LEDs, and they just barely fit in the switches. In fact, they kinda don't: OEM-profile row 3 keycaps will hit the LED and can end up stuck in place. Fortunately, that isn't a problem with my beloved DSA profile.