[thstone]

In regards to the stock seatbelt, you should be able to continue to use it with a couple of provisos;

First, depending on the width of the seat, it can be hard getting the stock seat buckle into the stock receptacle with a tall-sided aftermarket seat. The problem is that the receptacle will now be below the level of the base of the seat rather than sticking up above the base with the stock seat. This can make it hard to insert the buckle properly because the receptacle is wedged between the seat side and the center console. You'll get used to it quickly but anyone else driving the car is likely to struggle a bit.

Second, how the stock seat belt fits you in the new seat is important for obvious safety reasons. The seat pictured is fairly deep and if you are thin, then the stock belt may only touch the high sides of the seat and stretch across the front without really touching your hips/waist. That is not how the stock 3-pt belt was designed to fit and may be a safety concern.

Third, in regards to comfort, I understand your dilemma but you'll have to haul your butt up and over that tall seat side every time that you get in/out. Again, you'll get used to it but someone else may find it annoying.

And lastly, as you lift and maneuver your butt to get in/out, you will invariably rub against the drivers side bolster each time and that will greatly accelerate the wear on that portion of the seat. Depending on the material, it can wear through rather quickly.