You will need the OD and spline count on the rack end. It looks like you have a manual rack, so it should be 9/16 -26. The power rack is 3/4-36.
The shaft should be a 3/4 inch double d. AKA - DD On mine the 'flat' is .581 and the round is .746
I have some charts for those type of joints, but I still can't figure how to post an image on here. Also, Moog has a detailed chart for coil springs. I'll try to PM you a link to that.