I know there are a couple of guys on here that have arch extensions and need rubbers for them, I also need said rubbers! I just watched an Aussie video and they called them "flare gaskets," so I you googled it and there are specific products out there, here is a link to some on ebay, it's from Russia though! I'm sure there will be better places to buy from but I'm struggling to stay awake
https://www.ebay.co.uk/itm/Rublok-Bl...8AAOSw8mxamCxt