My 5 smooth cowl with a different engine mount, has allot of aluminum 1" pipe , especially the bends for the radiator routes, maybe you can find that easier.
Another option is to find a spring that fits nicely inside the hose to keep it from collapsing in a 90 , there are external spring setups as well , I got some at NAPA or Auto Parts Plus I think , not sure if there is one for 1" though.