Did not mean to ruin your day. I actually started on my Goat resto the same way. Came with a 70 front end also. What I found out is that the 70 Triple tree where the lowers slide in, the tubes are longer. Also the lowers are longer on the portion that slides into the tree tubes. Plus the hole dia. as mentioned. Still trying to find the correct bars. As like you I have the correct tree/tubes and springs at this point. You may want to also check the rear shocks. They may be 70 on up. To accept that 70 rear rim. No doubt you should be able to sell off the 70 stuff to get the correct 69 stuff.
Regards,
Joe51