The rubber leak back hose is P# 95050399
The clip that retains it is P# 96127591
Consider this part a consumable item, so order a pair. If yours has the original stainless steel, click-clip, you can reuse it, if not order new clips, or a hose and clip as a kit.
The hoses normally perish and split at the top, where it pushes onto the steel return pipe. As a temporary measure, cut the hose off the steel pipe and push the remaining hose on.
Hose.
Original type clip.
A 2.1Td makes an excellent daily use car, especially useful in estate form. It looks like it's Sd trim level, any more info? Is it manual, or auto?
The Rp number printed on the left front door A pillar is important for technical information and parts. As the car was registered April 1993, it could have an early Hydractive-2 system, as opposed to Hydractive-1. The Rp number will tell all, as all Xm built post 11th February 1993 are Hydractive-2, Rp 5930 on.
There are some windscreen side trims available in the Sales/wants section of the forum.
My preference would be to re silver the bumper and trim inserts.
Be attentive to corrosion, it is the killer of an Xm, mechanically they are very robust and will cover very high mileages.
Don't be scared of Citroen hydraulics, they are very simple and generally reliable. There is nothing you cannot fix yourself, with basic tools, on an Xm.
I'm sure there will be trials and tribulations, but stick with it, a properly working Xm is a real treat to drive and ride in.
An overview of the hydraulics systems can be found here.
viewtopic.php?f=13&t=10291
The low beams issue is likely to be the relay behind the right headlamp not making good contact in the holder.
Series 1 electrical diagrams can be found here
viewtopic.php?f=8&t=10268
The Haynes ones are accurate for what they cover, as they are re-drawn Citroen diagrams.
91 3.0 sei M. 4852 EXY Black
92 2.1 sed M. 5740 ECZ Sable Phenicien
92 3.0 V6-24. 5713 EXY Black
92 2.1 sd M. 5685 ENT Blue Sideral
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90 2.1sd M. 5049 EJV Mandarin
92 2.1sd A. 5698 EJV Mandarin
94 2.1sd A. 6218 ERT Triton
91 2.0si M. 5187 EWT White