Good info thanks for that i'll call them tomorrowI have these but yours seem to be different in width.
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Perhaps a rubber grommet supplier can help.
They have done some stuff for me before in silicone. The cost was a lot less than I thought so perhaps give them a try.Grommets Ltd are leading UK Manufacturers of Rubber Grommets. We stock Rubber & PVC Products including; Grommets, Feet, Washers, Ferrules, Grips, Sleeves, Bushes, Spacers, Plugs & Bungs.www.grommets.co.uk