On my 2000 C310, the leather cover is torn and in need of replacement. Looking at the Edson website, there two options based on the shape and size. "D" vs. oval. I can't tell the difference. Anyone know what's on the boat? The difference in diameter is 1/8" which is within my margin for measurement error. 
defender.com
or
edsonmarine.com
thanks

Edson Comfort Grip Leather Wheel Cover Kit
Create your own luxury steering wheel with Edson's exclusive "Comfort Grip" Leather Wheel Covering Kit. Give your wheel the ultimate feel! Edson's do-it-yourself Leather Wheel Covering kit looks great and make any wheel softer and warmer to the touch. Fea

ComfortGrip Leather Wheel Rim Cover - 32"-40" Dia. (Gray)
Create your own luxury steering wheel with Edson’s exclusive “Comfort Grip” Leather Wheel Covering Kit. “Comfort Grip” cushions the wheel and has contoured finger grips on the inside of the wheel rim. Each kit includes a pre-punched leather cover, double sided sticky tape, thread, needle...

thanks