What spotlight part is this?

[kango]

Hi, I'm trying to replace 4 of these spotlight caps because they're badly corroded. I guess the previous homeowner should have chosen white plastic / ceramic and not metal for the bathroom

I can't work out what the spec of these caps are. They screw tight to the ceiling with a quarter turn. The single image on the black background is what I've just bought but now see that's not compatible. Any direction to the correct part would be appreciated, thanks.

 

[ericmark]

I would think you need to change the whole lamp, they look like MR16 compatibles, I think the first picture is showing a GU10 connector so they are low voltage (230 volt) lamps not extra low voltage (12 volt) so no transformer required, whole fitting can cost less than £4 so not likely to find spares for them.