Hi, im trying to find a replacement rear light for my partners 2017 octavia vrs the rear fog light isnt working and it seems to be led? but cant seem to find the right one? I think the part number is 5E5945712A but again im not too sure? Whats the difference with the same number ending with an "a" as opposed to not? Any help appreciated!

Is it just one side that's not working? If so you need to activate the other fog light using vcds or OBDeleven.
If it is broken you can find new OEM parts on https://www.skoda-parts.com/catalog/octavia-3/spare-parts/electrical-equipment/lights/taillights-500.html
5E5 945 712 A TOP-LED This part fits RHD (right-hand drive) vehicles only!
5E5 945 712 TOP-LED This part fits LHD (left-hand drive) vehicles only!

Thanks for the reply, yes it just failed an mot on drivers side fog not working. It has been misted up for a while so assume the led is just corroded. Is it supposed to have one each side? We have since ordered a new u it from skoda parts so thank you