Hi I have a set (repro from Just Kampers) for sale. NOW SOLD In theory the end caps should all be orientated the same way (see parts book diagram below) and therefore specific to one side. The ones I have for sale, two are orientated one way and two the other so I guess you could fit them to either side of the van. Price: £17.50 via PayPal (as a gift please) to include postage within the UK.
I thought they were universal and fitted both sides. The brackets on the actual ones are wrong. If you swap them around you'll get them to fit.
If you swap the top bars left bracket with the bottom bars left bracket and vice versa and that should do the trick.