i've seen a lot of pictures of is-f original steering wheel, in comparison with standard is-x50 steering wheel.
i've noticed also a difference in terms of smooth leather length on the bottom of the wheel.
In other words, is-f wheel is 3/4 perforated leather and 1/4 smooth leather, but this 1/4 portion of wheel is little than the 1/4 portion of standard is steering wheel.
can someone very kindly take a measurement of the length of is-f smooth leather 1/4?
here 2 pics: