I know of no production figures that Chevrolet kept for any accessories like the 1940 spinner steering wheel. I have one on my '40. It is by far the most talked about accessory that I have when people see the car. When people buy an unfinished spinner steering wheel on ebay for $300 or so, they often forget that to restore the wheel, they will have to spend $300 to chrome plate it, $250 to have the rim remolded, $85 for a new stainless horn bar, $50 or more for a horn button.
Central #7A Area Directorwww.1940chevrolet.com
VCCA # 28873
VCCA #83 Tool Technical Advisor for 1937-1966