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?
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
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