Belmetric may be all that, but your Friendly Local Auto Parts Store (FLAPS) should have the correct 8x13 hose in stock, unless they are all about 'murrican cars.
And recall that the fabric braided lines tended to get brittle, crack and ... there goes your car. I once took apart two VW engines for a friend's bus. We mixed and matched and got a running engine with nicely cleaned and painted shrouding. Two months later his sister borrowed the van to move her stuff. She "smelled something" on the freeway and by the time she pulled over, the back was all in flames. Hot enough to melt the aluminum alternator support and part of the case as well. Still, some good came out of it: insurance paid him more for the van than we had put into it, though not as much as it would sell for today. We figured that the six or eight inch hose between the fuel pump and carb had probably ruptured, leaving enough fuel in the carb to make a goodly bit of flames back there. Since we hadn't replaced the bulkhead between the fuel tank and the engine, that probably contributed to the carnage. No one was hurt and I don't know if any personal goods were onboard when the fire started.
