I would say get 10.5D but if you have a printer you may as well print out the shoe guide from Rancourt. Here
If you are still uncertain about what size you should get, I suggest you to directly contact Kyle or email them thru their website Here
I wear 11 in Sperry and Sebago they give me a tiny heel slippage which I don't mind because I like it the way it is. My 10.5D loafer fits me rather nice and my ranger moc fits me TTS as well.