Thank you bigwinn, that's great.It’s the small rubber thingy that sits in the casing cover where wiring runs down to the plugs/coils
You’ll see a cut out where it pushes in.
Thank you both bigwinn and Zedebee, it does seem pointless but you never know, nice to have you both say the same.It should be a snug fit. But frankly, if it’s not there it’s not going to make a blind bit of difference.