Where to source a/c hoses

So I have a 65 valiant with the slant 6 and dealer installed a/c. The unit was flat so I filled it up and it worked great for a couple of days. Im sure the 59 year old hoses need replacing. Local auto supply is clueless. I have searched online and I find #10 and #8 hoses. #8 is close for the liquid line, but the #10 is 5/8 and the original suction line is 1/2. I worried the the extra 1/8 inch will cause leaks.
Also I need to replace the dryer that is 3/8 with a barbed fitting.
Ideas?