Tyre depots, Kwikfit etc will not usually supply caravan rims. There are actually very few different caravan rim sizes but obviously you need specific size. Elddis use BPW chassis I think, so I'm guessing bottom picture in my link would be correct rim, if yours is 5 stud.
There will be a size stamped on your rim, note this down & phone Western Towing for advice & they might be able to ascertain correct size for you.
I went to my local car tyre depot with a worn out, different sized different width spare tyre which I knew wasn't the right one. Took the size of the ones actually on the caravan with me as well. Plus how many bolts, etc.
They had to order one for me, but there the next day and now on the front of the caravan, ready to use, but hopefully (touch wood, cross fingers) never will be.
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No, wheel cannot fit both sizes of tyre, if your wheel is fitted with 14inch tyre then this is the size it must be. I think the rim I mentioned in earlier post would fit but you need to make certain. There will be numbers/letters stamped on rim somewhere, this is the info needed to get correct rim.