Wanted Green 39 tooth Speedo Gear

Well when I went from the 7 1/4 276 gear rear end to the 8 3/4 355 gear I forgot about the speedo. Went for a cruise out to the Fenton car show yesterday and Dam I was going 100 miles an hour, didn't seem like it. I looked at the charts for speedo gears and it looks like I need 39 tooth gear. 904 trans, 355 gear, 24" tall tires, I believe that looks like 39 tooth, if anybody thinks different please chime in. Now does anyone have one for sale? If so please drop me a line.
Thanks
Bob