I was kind of hoping I might be able to find the one I took out last year, as that wasn't actually damaged, just squashed flat, but it's not in either of my parts boxes, so I'm just going to have to wait.I have seen them on the place I got my rear locks,look same as well, you’ll be on Gretas Christmas card list how as your cycling Lol
Edit just seen this https://www.ebay.co.uk/itm/153060364654?fits=Car+Make:Seat|Model:Leon&hash=item23a31bd16e:g:gzgAAOSwLIpelW97
o-ring is hard to find and when you do there not in uk or not enough details, guess work at the most
Luckily I love cycling - it's just a shame that my girlfriend lives at the top of one of the biggest hills in Brighton.
Fortunately, I was able to find the eBay e-mail from last year when I bought the o-ring and could look up the part number from that, which is N90927302. Most of the measurements are coming up as 62x3mm, so I just ordered a bunch of those. It's getting pretty handy to have not just the parts numbers, but information that's going to help find an alternative when the OEM parts aren't as easy to find. One day I'll make a spreadsheet, but that seems a bit involved...
The good thing from all of this is that it looks pretty obvious there was a boost leak coming from the EGR valve, and judging from how dirty the EGR pipe was - especially at the top - it looks like there's been something getting through there too. Once it's all sealed up nicely, I might actually get that nice torquey acceleration again.