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1" steerer? I got a piece of 22mm acrylic rod from ebay to make a custom version, as the offset on my fork means the fender meets the underside of the the crown off perpendicular. I was planning on machining it myself but had to get a machine shop to turn it down as 22mm was too big. 20mm and some bearing fit might have done it. Got them to drill a threaded hole in the bottom and one to line up with the crown hole and then sawed/filed it to fit.
Either that or use an L bracket on that hole. Probably puts more stress on the fender though.
That COULD work maybe?? They're GB fenders with a vertical hole for attachment rather than a riveted on L bracket though..