My '78 4seater came with a flat wooden Moto Lita steering wheel which I changed to a slightly dished leather wheel of the same size. It is a Nardi and Super Spoke supplied a quick release boss.
This is one of the most successful improvements that I have carried out to the car.
The leather is particularly well shaped to fit in the palm of my hands and is slightly more giving to hold - a definite advantage on secondary uneven roads. When using the flat wheel, I would often knock the indicator stalk- this is eliminate now and this is so much better and safer.
I am over 6' tall and over 70 yrs-the quick release obviouslymakes exiting the car much easier but the main advantage of changing the wheel has been the comfort factor to my hands.
There is a cost however, the speedo is hidden from my direct view. But I manage, tending to drive at a 'sedate pace'!
John.