The driveshaft maker will want the measurements from ujoint center to ujoint center. As Jon suggested get everything in place then take your measurements. I’m assuming it will be that way on a T5. ðŸ›
Martin, when I was talking to various driveshaft companies, when I mentioned T5, none of them wanted to make a shaft without including the new yoke. DSI (the folks I used) said I could ship them my used yoke which they would inspect and use but unless I did that and they used a new u-joint and balanced the whole she-bang there was no guarantee on the shaft.