Just like the "non serviceable" joints in the driveshaft, we will be replacing the staked in joints on the steering shaft.  As previous posts have correctly noted, they are 15x39 mm, and staked in.  I have located and ordered some u joints from DRIVESHAFTPARTS.COM at a great price and very reasonable shipping.  They are specifically made for staked in assemblies. Part #UJ1540SD. I ordered 4 of them with shipping for $28.52, just in case I damage one during installation.  They also offer a very n