Thanks Chaps,
Tank persuaded into position and bolted in last night, the filler neck looks nicely centralised in the hole.
Had a trial run with the old grommet (with lashings of lube Darren!) and, as expected, it split
Pete, I am assuming from your comment that the new grommets suffer from the prevalent dodgy rubber syndrome? Looks like I have no alternative now unfortunately..
Cheers,
Keith