RD400F frame info

[car91r]

Need some help restoring an RD400 Daytona frame. Previous owner had removed the foot peg mounts to add their own home made rear sets. I am now trying to replace those studs to install footpegs. I ground out the old remains of the studs and machined new ones. Question is, how far do they stick out of the frame? If anyone has a frame, I need the measurement from the frame to the end of the stud.
Thanks!