I ran into a similar situation here in NW Montana. I just wanted to have some touchup paint for my 2015 Big Country. I contacted Heartland Service where they confirmed, they do not provide touchup paint for their RV's (they need to reconsider this). They did however immediately email me the specific Sikken paint formula. I then took it to our local NAPA Auto Parts store only to be told they cannot cross-reference Sikken with their brands. They tried doing the camera scanning, but won't guarantee matches.
So after numerous calls to several other local auto paint stores, who told me the same thing and doubted anyone in the State carried the brand; I finally found an O'Reilly's Auto Store in Billings Montana (500 miles away) who does mix Sikkens. So I have now faxed the Sikken paint codes/formula to them and they are mixing up some small bottles of touchup paint for me and will ship it free to my local O'Reilly's store for pickup. Cost is $14 per little bottle, which is about standard. They also have the ability to put it into spray cans, which could be nice.
Perhaps other O'Reilly's in your location can do the same thing?
Lowflyr