Actually I just looked back at the invoice for my RSE wiring harness purchased on 5/10/21 for which I paid Jestex.de 318 Euros via their eBay account.
The harness was actually shipped directly from Kufatec with Kufatec paperwork to me and I also paid £51.45 for Duty, VAT & Handling directly to DHL.
When I asked Stefan from Jestex about the wiring diagram (2nd attempt as he didn't reply to my first email) he said the following on 11/10/21;
----------snip----------
Kufatec has some good items but also only offers support for the direct customers.
I now downloaded the Schematics for your car and will give you the solutions tomorrow.
Sorry for the new delay, but it's a bit more complicated than connecting a 12 Volt Jack (Hope you know what i mean)
----------snip----------
Despite two more emails from me I never did receive any further reply and so here I am some 15 months on still scratching around for wiring information...
-=Glyn=-