Injector green seals

Hi all, I have a 1991 golf GTi cabriolet and wanted to know where I can get hold of the green injector seals from as mine have become hard over the years. Are these still available from dealership and if so what is the part number. I have seen these on eBay but am a bit cautious buying things like this from eBay as they can sell anything which may not be able to withstand the heat in the engine bay. Also there is a small black o ring at the bottom, would I need to change these as well, if so what is the part number and are these available for dealership. Thanks in advance.

Borg Warner has them.  I have used them over the years.
Over hear you could buy a box of 8 of them for less than 4 bucks IIRC.  

They were brown or black and they worked just fine.  Spray them with WD-40 as it assists in getting back in easier.

Borg Warner are they based in the UK or abroad

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Also would you have the part number or reference number for these

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Look for BWD/NIEHOFF 274572

https://www.heritagepartscentre.com/uk/034133557e-upper-fuel-injector-seal-k-jetronic.html

91's should be Digi, not CIS. Well at least over on this side of the pond they are.