If you get what's called the Akra Optional headers, then yes, your stock can will work with the headers. It's when you try to change the can on an Akra full system which is the headers and can all in one package where you'll run into problems using any slip on option. I have the SS Akra Optional headers on my K67 using the OEM Akra can and it fits perfectly.Lovely, congrats.
Would you mind adding the part number for the akra headers you bought? Just so I can confirm what I'm seeing on ebay is correct.
And curious, does anyone know if those headers will work with the stock (non-akra) can which comes with the base bike?