If you mean more than one chassis brand, I can’t think of any, but I suppose they could. There are plenty that import one, but also distribute others. Then there are those that import multiple lines, like maybe a kart line, and a seat line, and perhaps a bodywork line.
KartLift Kart Stands
DeepSeat Kart Seats
He is looking for an importer as I emailed them looking to try his chassis. A few years ago a guy in ALBQ NM was the importer and I was able to try out a kart while visiting family.. I wonder what happened. I know the track was bought by a new owner..