I did the LED highlights a couple of years back using
@Pauly ‘s loom and remote tech support, and was always going to do the washers. In fact I bought a complete pipe setup from EBay, that I will eventually get round to fitting. If it would help, I’ll get it out of its box and take some pics.
I would add that in 2.5 years of having the LEDs and no washers, I’ve never had an issue including having the van MoT’d twice and trips across Europe.
Just started the whole process again for my Lad‘s MK7 Golf, but fortunately been able to get a complete 2nd hand bumper with all the pipe work attached and was working before we stripped it.