Indeed they are just bolt-on. TRF makes a nice replacement set that are powder coated. A thought for anyone with either a TR4 or 6, consider taking you old ones out and replacing with new. Cheap enough. But what you might find inside the fender cavity is priceless. Hopefully no rust but know that the scuttle vent dumps right into this area and drains down into small gaps where the rocker and fender join. Not, IMHO, a good design and a potential for major headaches. I was fortunate in that mine only had surface rust and was able to scrape, treat and repaint. Too, instead of having the scuttle drain into this cavity, I extended a new rubber hose to exit down to the front bottom lip of this panel and dump water into the wheel well. Works well. A nice weekend project.