Tom Langdon at Stovebolt Engine company makes an adapter kit for a T-5 to Flathead setup. It consists of a thin metal ring that fits over the input shaft housing, a bronze bushing for the flywheel/input shaft nose, and a bronze bushing for the throwout bearing. You could probably figure out the sizes and buy the parts from a power transmission outfit, but Tom's a great guy to do business with, and why re-invent the wheel? He has a website, think it's www.stoveboltengineco.com.