Most parts such as taps, fridges etc are common to most makes of caravan and are available at most caravan dealers.Is there something particular that you are looking for?
Rob
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As Rob and Tina has said most caravan parts are common to all caravans... Do an eBay search for caravan vents and see if the one you want is there - if it is then nearly every caravan spares stockist will usually sell it.
Again with the hand brake lever - find out the chassis manufacturer then ask at your caravan dealer (or eBay Search) for a hand brake lever for that chassis
------------- Caravanning is a way of getting a cheap holiday out of an expensive hobby