Engine harness replacement for '92/'93 500SL

[LeaUK]

Hi all

Long time no see I know but the time has finally come to change the harness (due to intermittent ASR light and visual inspection of my harness) and I've been looking through many pages here including the DIY section, but just can't locate a few things. If someone could point me in the right direction it would be very much appreciated:

1. Where can I purchase the wiring loom from (preferably in UK, but no harm in shipping from Phil if he carry's stock)

2. I see there are upper and lower parts - rough cost for individual and both?

3. I guess I should do both?

4. Does the Electronic Throttle Actuator (ETA) unit connect to the new harness? If so, I seem recall from memory I need to strip the ETA out also and rewire this manually. Does anyone specialise in this repair - I seem to recall a few US places but anyone know of any UK based?

Many thanks
Lea