I have a GlowWorm boiler, a fuel saver F model 100F which is around 1989 vintage and is fine apart from a noisy fan. My local Gas Safe man checked with his usual supplier and the fan is obsolete but he did say if I found one he would fit it as part of the next service. I have bought and received a brand new item (old stock from a local company) but it is missing the seal that goes between the fan and rear casing of the boiler. If you google the fan part number 417876 then a silver foil looking seal is on the original manufacturers photos but various eBay reconditioners seeem to sell them with a foam looking seal. Any ideas what seal I can get/what is suitable? Thanks