When it comes to buying high seats (and i'm talking about good quality ones not Chinese monkey metal) then you are best going to your local engineering company (every farmer will know someone) and getting exactly what you want whilst also supporting the local economy. You may also find that some like stalking/venison/small pieces of purple folding paper ect which can help with the cost. There are enough people on here to help with dimentions if you are unsure of anything. In my opinion the critical measurement is from the surface of the seat to the top of the shooting rail; this should be 22 inches. I have found this to be the best compremise for all sizes and shapes of people and rising or falling ground. The only thing to watch out for with agricultural engineers is they tend to make things too strong, and therefore heavy, by adding braces everywhere and using box when angle would do. You can't blame them and they think they're doing you a favour but its something to watch out for. I have turned my back on wooden seats these days and I would also be very reluctant to have anymore single seats made, doubles are so much more versatile. Galvanised is good but properly primed and painted steel lasts well too. JC