Really sorry if this comes across as noob, but i've only had the FN2 for 2 weeks and we're still getting to know one another having had an EP3 before!
So, i've bought 501 bulbs for my sidelights, go to fit them and the bulbs currently in there are seated in metal holders with a round(ish) disk sitting at the base of the light which is clipped in with one of those wire clamp things.
Went to change the bulb, my 501 bulbs have come as just bulbs with the wedge fit - as to be expected I know, but how on gods earth do i transplant the 501's into the metal bulb holder so I can get it locked in and plugged in to go?
Thanks in advance!