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Use Google and search Images of your specific RV light. Then, drill down into each light picture - to see the seller's details.
When comparing different sellers, do remember their selling + shipping price comparisons. And yes, exact same item does have dramatic variance (from different sellers)..
For me, I bought a few RV parts from other side of country and got their FREE shipping. In the end, I paid much less - compared to buying at my local RV Parts store. And best of all, the parts were delivered directly to my post office box (instead of me wasting time & gas driving to local RV Parts store as well).
Google search using their Image feature works for me….