Refitting indicator cap woes
 

Someone nicked my indicator cap and the other indicator broke (these are front ones BTW) against my garden gate, so I took the cap off the right one to put on the left one (which is atm an uncovered bulb). However, the bugger just won't fit on! I'm considering getting a new set of flush-mount indis but how hard are they to fit in and what sort of make are decent. Can't be faffed with LEDs and the such.

Thanks in advance!