Will be dragging this out from under the dust in a few months to finish it off I've had a lot of projects on over the last few years and I've had to be patient to get through them 3 cars rust removed and painted many mechanical repairs so I am looking forward to getting her out again.
These fit the 349 tanks perfectly.https://www.ebay.com.au/itm/2X-Barb-Red ... 2749.l2649
Now I got the grommets from south west montesa but seems his site has gone so try buying petrol and oil grommet and if that doesn't work possibly one from a bong shop in Nimbi might be suitable or might not be. With oil in resin I imagine the rubber grommets might be compatible with oils hence compatible with petrol. Worth a try if you can't find correct size next option is to go up in size and drill to suit or get a brass barb made to suit.