Long time ago, I was told from Japan that one of the coolant hose was on back order but with estimated next delivery schedule so didn’t worry too much as I had enough stock. I normally keep 2 full set of coolant hoses with extra hoses to cope with different spec depending on the year model/variant/etc. I even have a few LHD hoses as well. Then, I didn’t hear from Japan for a while but the planned delivery date was getting closer so ...