I got some approved for use with unleaded fuel hoze from a local established motor factor, fitted it to the BIS and to my 64 rover, the BIS had been sat for a while but the rover only 1 yr both had to have their hozes replaced, the bis spat it everywhere, on both cars the hozes were badly cracked, too often are these overlooked, I wonder if the rubbers used themselves are not suited to modern fuels? There is much grumbling in the classic world about ethanol added to supermarket fuels but I don't buy these for that reason. One thing for sure I always inspect fuel lines, nobody wants a fireball