I never cared for the stock seat foam on these Yamaha WR450's (which resembles dried pancake batter). I opted for the Guts tall seat foam and cover. In comparsion? stock foam to guts foam, there is none, the guts foam is way better. This thread has more to do with the actual shape of the foam. I've had the Guts foam installed for several months now. I guess I got tired of coming to a stop and falling over , so I decided I would just give guts a call and asked them just how much taller is their tall foam over stock. They replied about 1". I remember being able to touch the ground much better with the stock seat and thought perhaps the guts foam would settle in after a while and everything would be good. Being 5'11", I probably should have opted for the stock guts foam. Since I already had the tall foam, I decided the take it back apart and just see exactly what I am dealing with. I just happen to have an extra stock seat so I placed the two side by side and took a few photo's for everyone who may be considering a better seat. Guts was partially correct, their tall seat foam is easily 1" higher than stock but I noticed that it's also nearly 2" higher right where you need to be when moving up on the seat or coming to a stop. These 3 photo's are side by side comparsion between stock foam and Guts tall foam. I wish these photo's were better, they are not clear enough to show all the subtle differences of shape and roundness. You can see however the thickness and the 2X4 likeness of the tall foam. I quickly decided I either need to order the stock foam or modify the tall foam. The photo's below show the modified version. Again the photo's will not do justice to the actual shapes but I was able to shave the seat just to my preference. I placed the seat on and off the bike several times leaving the seat foam thicker where I needed to and thinner where I didn't. It's still thicker than the stock foam but a little lower and flatter right where the guts was the tallest. Sorry for the extra long post, but I felt the need to give back to so many who help me dial my bike in.