We added manufactured perch seats. They clamp on and give better visability. I can't recall the brand, but if interested I will look it up. They also have a web site. The 1st set was for a H34, no wonder they didn't fit well. The ones for the H37C fit better, but if I had it to do again, I would drill the seat support post myself. I ended up putting washers under the mounting to angle the leg away from the side.Larry - Hornizon - H37C