Correct fuel hoses/clamps info needed

Ok, pretty much every hose I need is NA. This is not a rocket science, hose is a hose, but I prefer to have something like what was on a bike from factory. Luckily, parts list has sizes. Unfortunately, those are metric (bad for US folks).

So, where do you get those and what would be appropriate inch size for those?

1. Air vent hose 5mm x 8mm 
2. Vacuum tube 5.3mm x 10mm
3. Fuel supply 6.5mm x 11.5mm
3b. Fuel supply 5.8 x 10.8 (parts catalog list 2 sizes, I assume second one is for US market/US made)
4. Little vacuum connectors between carbs 6mm x 11.5mm
5. Fuel overflow tube. Black, thin walled. NO sizes listed.

Anybody got good source for good OE looking stuff?

Thanks!

Item 4 - I make my own.  Item 5 - After looking around auto supply stores fruitlessly for several years I think I bought some from Webike a year or two ago.  For gas line I use 1/4 or 5/16 braided hose suitable for gasoline.  

You might want to try a place called Belmetric.com  They have a great assortment of not only metric nuts and bolts, but they have metric sized fuel hose and clamps.  I have used them for some items on my bike and others.  They aren't the cheapest but everything I have purchased was good quality.  They have quite a list of items to look through.  They also sell JIS screws in the smaller head for certain applications.  They shipped pretty fast before Covid.

Rick H.

Nessism suggested this and I’m very satisfied with its performance.