IF, your class C is on a Chevy chassis then any Chevy van doors will work! It shouldn't be hard to find them with power door locks and windows!! If memory serves that year model was used for severial years, and those fancy model custom vans are the most common out there. You may have to get a motor or solenoid for the door locks and one other thing, See if they have the pigtails for the power windows and door locks already under the dash! I am almost sure that they do which makes the job soo much easier!
1991 Chevy Pickup
1994 5th wheel 30 foot trailer