I was looking at two models below for sim racing and not am sure what the difference is. It seems it is the dimensions, but curious if anyone knows anything more about them? I know the materials are different for the outside of the seat, but curious if the inner parts are different? They are the: SPORTSMAN-PRO http://procarbyscat.com/seat/80-1615-57 SPORTSMAN http://procarbyscat.com/seat/80-1605-61l I like the sportsman pro, but I feel it might be too small for my shoulders, but not sure how racing seats are supposed to fit as they curve out on the sides. I am not tall, but have big shoulders and chest...small waist. Any input or experience with these would be appreciated. I will also be using the chair for other pc gaming as well...not sure if that would make any difference that I haven't thought of yet.