Sigurd is correct about the bolt. When you remove the PS unit, try to visualize (remember)how you have done this step because upon assembly you will come to a point that you cannot get the steeing coupler back together.
Do you have the PS lock bolt to set the rack center upon assembly?
http://www.*****************.com/category_s/381.htm
GL
John_AZ
1988 924S 58.5K --Replaced the PS rack in August, 2008