Thor actually put one on my unit. Call thor and talk to customer service. They should be able to get you a part number. My unit is at the storage lot so I can't get you a picture now. But is basically a plate screwed on left door with plate on right door with latch. Plates go between door facings so not so visible. Any dealer of Thor Diesel pushers should be able to order one. They are not specific to any particular unit.
Hope this helps.
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