There is a good chance you can find a set and a dealer to install, but do be aware that there are real problems with adding them on class C which do not come with that in mind.
We added them to a Class C Thor and were really bummed on what we got.
Step one is to look carefully at what you want, how low the ground clearance of the retracted jacks may be and where all the parts will be installed.
If you are not used to dealing with jacks, this can be a real mind bending process as there are a number of real questions to work out.
One biggie is the pump and reservoir assembly as it IS large and class C is not always built with the extra space so body mods are needed. Dash space or location for the controls? Pump, controls and level sensor will all need to be sorted out.
Final problem is how to get those set where YOU want them and I would suggest getting that talked over with the installer and then get it in writing before turning the RV over to them.
We got burned on the final point! We went to Camping World, where we did the walk around and talk with sales about where each item was to be located and then they turned it over to install who did it the way they wanted!
We wound up with nothing where we talked about with a back compartment modded to let the jack up into it when retracted and a front compartment lost when they installed the pump in it, rather than underneath.
Class C often have smaller tires and fit lower to the ground, making the jacks have to go up higher to clear. That higher may mean it goes up into the interior at some points.
Lots of variables like slides which can not be modded to take a jack sticking up out of the floor.
2015 Winnebago Vista 31KE on 2014 chassis