Hi Graham
I have the same panel as shown in Martyn's link, it's a good panel but needs a good fabricator who knows his job to fit it. The first attempt by my Bodyshop I rejected, it had been done by one of the crew who clearly didn't know his stuff. It had been welded on at the wrong angle and the guy had to cut the plastic trim to make it fit. It was glaringly obvious to me that it had been badly fitted. i took the car back along with a profile that i cut out of card from the other side to show what a poor job had been done. The owner who's work I respect greatly ordered a repacement and this time it was done properly, i also got a new under trim as the other was now unfit for purpose.
The fit is great and matches the other side perfectly, in summary, the panels are good and taken from the original but you do need a good Bodyshop to be able to fit it properly. compound curves always need a little extra thought and planning.
Pete