Mine were held on with aluminium angle bars bolted to the edge of the panels then U bolts through the angle then bolted either side of the foot bars I’ll try find a picture. Found a picture not very clear but hope you understand itthanks Annie…just found a video on the tube where “crab clamps” are used to fix it on, just need to see if I can het them here/UK……
Do not forget the 20% that I had to pay on bits from there on the spares I bought, they expect you to claim it back from the German finance dept.I buy mine from Ebay.de the rules in Germany are better than the UK I think, postage is about the same if you search around.