Vintage Dirt Bike Q & A

Hi, I was wondering if anyone had a stock 34mm Keihin carb from a 73-76 CR250 that they could take a measurement off of for me. I am trying to adapt some rubber manifold boots from other models along with some custom intakes I am machining. I don't care for the current aftermarket intakes which look goofy with the flanged adaptor stacked on top of a machined intake. Unfortunately, my 75 CR250 does not have the stock carb currently. All I need is the diameter of the carb mount on the intake side. I beleive it is 40mm but would like to make sure. I know there are grooves around this diameter, I just need the outermost (largest) diameter ignoring the grooves. If you have a caliper to stick around it that would be excellent. Thanks a lot for any help.