Most Jaycar stores will supply the globes at a fraction of the Caravan Supplier cost - although if you need to replace the actual light fitting you may need to go to Camec or Caravan plus.
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Possum; AKA:- Ali El-Aziz Mohamed Gundawiathan
Sent from my imperial66 typewriter using carrier pigeon, message sticks and smoke signals.
If not replacing with the same unit check to make sure LENGTH WIDTH SIZING is the same or larger to cover wiring hole and old screw holes .
Solder and heat shrink wiring
Attach light and seal with this Sika Sil Industrial [used for Van construction ] Bunnings order in 6$ a tube tradies.sikaretail.com.au/products/sealing/external/sikasil-industrial/
You might be lucky & find new light fittings that will fit perfectly, some you may have to "do some fiddling." As swamp said, there are bulbs that fit the standard 12v holders but you may have to add a piece of mirror behind them to get maximum reflection.
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Warren
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If you don't get it done today, there's always tomorrow!