I need to get another saddle and the man at the shop said I would probably need a 17 or 17.5 inch wide fitting although he has nothing suitable in stock. What size d - d would a wide be. I have seen some that are 9 inches medium to wide and 9.5 inches extra wide? Is a wide a certain size or differs between makers? My mare has hardly any withers and is quite trim and is 14.2hh. I dont know much about saddle sizes so any help much appreciated here, especially those section d owners! Thanks xx