Most new coaches are using more unique headlight ( projectors) and twilight assy but in the past they pulled headlights and taillight assembly's from late model cars and trucks. As said the dot number can give a clue to what that is. For a 2000 coach that might be a 98 car or truck. My headlight was 300 bucks via RV dealer eBay got me the same light for 50. Made in China but when I compared them they were identical .. same manufacturer. Just a 250 profit to the RV dealer.
What year is your rev? Perhaps if you gave that info someone might know and be of more help