
If people contribute information and recommend suppliers of reliable aftermarket alternatives for specific parts, where appropriate, I'll copy it into a list of vehicle systems (including a note of who has made the recommendation, so as not to pass it off as me!) to make it easier to find the relevant info. If parts are specific to particular engines / fuel types it would be useful to include that as well.
Very grateful for any info.
Tony
1. Servicing parts
Some of these bits and bobs are available from Brickwerks http://www.brickwerks.co.uk/
2. Engine
Oil pressure switch; andysimpson and Westy.Cub.Joker recommend VW for these.
3. Cooling and heating system
* Header tank and its 'dalek' cap; VW (several people on 80-90 have reported problems with aftermarket versions of these). VW header tank caps are also available from Brickwerks
* Water pump (DG / petrol engine): no longer available from VW but GSF do one. http://www.gsfcarparts.com/
* Thermostat housing (metal one for the early DG engine); no longer available from VW / anywhere else - try people who sell used parts for one of these at the moment (Feb. 2008)