Carb Rebuild Kits
 

Where would be the best place to get these for the 160?

Interestingly enough Honda doesn't offer "kits". They sell the individual pieces, if you can get them. So that means the aftermarket and usually eBay. The ones from Canada are ok. Generally, often jets are not the correct ones in the kits I've seen and some kits you don't get everything, the bowl gasket hangs the float etc.
In my opinion most jets and orfices, unless corroded or drilled to an unknown size, are reusable, so I clean and save them. I use the manual as a base line for jet sizes but I'm at sea level so things don't change much from stock jetting.

Can I get a different carb to fit the 160 --cant find a good original or rebuid kit
thank you

It's difficult. Parts are available you just need to order them individually from the Honda dealer. The Sirius and Keyster kits are only adequate IMO.
L