Rivco risers for 2015 roadster, where to buy them in US?

So finally I got the risers from eBay.

Installed them, rerouted the cables behind the upper yoke.

However, the throttle cable is very tight, even when the handle is straight…

What is the work around that…has anyone else got the same issue with rivco risers???
 
I can't remember where I got mine, but there are companies that will make custom length throttle cables. Barnett, maybe? Try googling
 
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