I know this is going to be an odd request. I just sold my 2010 Gen III Prius. I need to get a measurement of the seat, just the part you sit on. From back to the edge. Not side to side. Could anyone who has a 2010 model take a quick measurement for me? Thank you so much!
I came up with 21 inches, measuring from the back seam, just under the lumbar bolster. Add 2 inches if you're wanting to include the full depth to what the rear passenger sees.
