Replacing a headlight (X Reg Yaris) Help pls

[*Cooperman*]

Hi peeps,
Sorry my first ever post is asking for help.

Firstly, this forum is awesome, the amount of knowledge you people have is very impressive. Thanks alot

Thing is, im trying to help my brother tidy up his X Reg yaris and we want to replace one of the headlights.
The OS lamp has become seriously dis-coloured (yellow-ish) and the NS looks as new.

Searching through , i have learnt that it is not an easy lob (loosening the upper part of the front bumper and the screws in the wheel arches).
Any tips? Advice before i take this on?

The issues i have come across is ordering the new part online;

Part number - Without taking the old one out first, is the part number visible? I can see details on it, but i can't get them to match with any part numbers.

Two Different types - Is there 2 type of headlight for this car? ('Electric Adjusting' and 'Manual').

Thanks in advance
Tom (Cooperman)