Here's what I did to mount fenders on my Steamroller (with track ends); I got a set of SKS P45s, and mounted the front one without the included plastic quick release pieces at the bottom of the fender stays. I just used bolts and p-clamps to attach the fender stays to the fork. I saved the plastic pieces for the bottom of the rear fender stays. Mounted those to p-clamps and then attached the fenders to the quick release pieces. Everything was plenty sturdy, and to get the rear wheel out, I just popped the fender out of the quick release pieces to give it enough wiggle room to get the wheel out. Pretty simple and worked great.