[ZeGermanHam]

Right, but the seat cover will still need to be hog-ringed to the same location despite the increase in bolster height. If you increase the bolster height, there is the risk that the seat covers will not extend down far enough to allow for hog-ringing in the correct location. It just depends on how much leeway the seat covers provide, since you're essentially asking them to grow in size without providing any extra material. Perhaps it will be fine, but that's the aspect that I'm curious about nonetheless.